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In order to complete the release of the application, an engineer needs to apply for a digital certificate, which of the following options is correct about the description of the digital certificate?

A.

is in the format of .csr

B.

contains the public key in the key pair

C.

Digital certificates are used to ensure the integrity of the application

D.

is issued by AppGallery Connect

If a developer wants to use the device virtualization feature of HarmonyOS, which subsystem will he use?

A.

Location Services subsystem

B.

DV subsystem

C.

Media Subsystem

D.

Safety subsystem

Which of the following databases uses SQLite as the persistent storage engine in HarmonyOS data management?

A.

Relational database

B.

Object-relational mapping database

C.

Lightweight preference database

D.

Distributed data services

A HarmonyOS developer created two serial task distributors, dispatchera anddispatcher_b, and also created a proprietary task dispatcher. Which of the following scenarios can cause deadlocks due to improper use of syncDispatch?

A.

On a dedicated thread, dispatchers are used forsyncDispatch

B.

uses dispatcherb to dispatch tasks synchronously in dispatchera tasks

C.

In the tasks dispatchedby dispatcher_a, the dispatcher_a is used again to dispatch the task

D.

The thread pool is full

If a developer develops a HarmonyOS application and remotely launches a Page on phone B, which of the following permissions does not require the user to request authorization by sending a pop-up window at runtime?

A.

ohos.permission.GET_DISTRIBUTED_DEVICE_INFO

B.

ohos.permission.DISTRIBUTED_DEVICE_STATE_CHANGE

C.

ohos.permission.GET_BUNDLE_INFO

D.

ohos.permission.DISTRIBUTED_DATASYNC

When a company is developing a HarmonyOSapplication, it needs to customize an artboard control, how to get the X coordinates of the current touch point in the whole screen during the listening of touch events?

A.

touchEvent.getPointerScreenPosition(touchEvent.getIndex()).getX()

B.

touchEvent.getPointerPosition(touchEvent.getltem()).getX()

C.

touchEvent.getPointerScreenPosition(touchEvent.getltem()).getX()

D.

touchEvent.getPointerPosition(touchEvent.getlndex()).getX()

The Web-like development paradigm provides a series of lifecycle callback methods for custom components, which are the following lifecycle callback methods for developers to manage the internal logic of custom components?

A.

OnAttached

B.

Onlnit

C.

OnPageShow

D.

OnDestroy

Regarding the service cards of HarmonyOS applications, the following belong to the card users

A.

Traditional Applications

B.

Service Center

C.

Desktop

D.

Atomization services

Regarding the callback event of the Video component, the following statement is incorrect

A.

onStart is triggered when the video is playing, and you can get the video duration here.

B.

This event is triggered at the end of the B onFinish video.

C.

Thisevent is triggered when the C onPrepared video is ready.

D.

onUpdate is triggered when the playback progress changes, the unit is s, and the update interval is 250 ms.

There is a configljson configuration file in the root directory of each HAP (HarmonyOS Ability Package) of a HarmonyOS application.

A.

app

B.

deviceConfig

C.

module

D.

abilities

A HarmonyOS application developer displays three flowers in the form of a list, and the interaction logic code of the page is as follows.

A.

The data for the A listcomes from the textList array, so the list will display three rows

B.

src indicates the path of the image, and value indicates the name of the image

C.

The three images are placed in the images subdirectory in the common directory of the same level as the file on the project page

D.

The developer defines the contents of the textList array, which contains three elements

Which of the following items belongs to the kernel layer in the system architecture of HarmonyOS?

A.

LiteOS

B.

HDF (Hardware Driver Foudation)

C.

Linux Kernel

D.

KAL (Kernel Abstract Layer)

Which of the following operations can be performed through the @ohos.systemTime module?

A.

Set the system time

B.

Set the system alarm

C.

Set the system period

D.

Set the system time zone

When developing a HarmonyOS application, which of the following notification types can be implemented by developers?

A.

Plain text

B.

Long text

C.

Image

D.

card

E.

Media

F.

Multiple lines

Which package is imported using the preferences?

A.

@ohos.data.rdb

B.

@ohos.data.preferences

C.

@ohos.router

D.

@ohos.data.storage