有如下程序段：其中会产生编译错误的语句是（　　）。

A、④

B、③

C、②

D、①

当计算机突然掉电后，计算机中（）信息全部丢失，再次通电也无法恢复。

A、ROM和RAM中的信息

B、RAM的信息

C、ROM的信息

D、硬盘中的信息

The validate_password plugin is loaded and displays the following settings in global variables: Mysql＞ SHOW VARIABLES LIKE ‘validate_password%’; When attempting to set your password, you get the following error: Mysql＞ SET PASSWORD = PASSWORD (‘Hoverl@%’); ERROR 1819 (HY000): Your password does not satisfy the current policy requirements What is the cause of the error?（）

A、 The password is eight characters long, but needs to exceed validate_password_length to be valid

B、 All of the MEDIUM password policy requirements have not been honored

C、 The password matches a substring Hover as a dictionary word

D、 The password does not match the validate_passoword_number_count requirement

E、 There is no dictionary file defined, so password validation cannot work as expected

以下哪个公式为计算活动历史提供了最精确的结果（）？

A、AD=工作数量/生产速率

B、AD=工作数量/资源的数量

C、AD=工作数量/工作数量

D、AD=（生产速率×工作数量）/资源的数量

Click the Exhibit button. In the exhibit, you decided to change myHosts addresses.What will happen to the new sessions matching the policy and in-progress sessions that had already matched the policy?（）

A、 New sessions will be evaluated. In-progress sessions will be re-evaluated.

B、 New sessions will be evaluated. All in-progress sessions will continue.

C、 New sessions will be evaluated. All in-progress sessions will be dropped.

D、 New sessions will halt until all in-progress sessions are re-evaluated. In-progress sessions will be re-evaluated.

国家支持企业、研究机构、高等学校、网络相关行业组织参与网络安全国家标准、（）的制定。

A、 行业标准

B、 行业

C、 行业准则

D、 标准