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[问答题] 急性毒性试验的目的是什么?

下列砌体工程的各部位中,不得设置脚手眼的有()。 ["120mm厚墙","240mm厚墙","宽度为l.2m的窗间墙","过梁上与过梁成60°角的三角形范围内","梁或梁垫下及其左右500mm范围内"] Given the following requirements:Create a table named TESTTAB, which has an identity column named ACTIVITYNO. Define the identity column to generate the values for the column by default. Start the values at 10 and increment by 10. Make the identity column unique. Which of the following CREATE statements will successfully create this table?() ["CREATE TABLE TESTTAB (ACTIVITYNO SMALLINT NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 10 INCREMENT BY 10), ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTIVITYNO))","CREATE TABLE TESTTAB (ACTIVITYNO SMALLINT NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 10), ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTNO))","CREATE TABLE TESTTAB (ACTIVITYNO SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 10 INCREMENT BY 1), ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTIVITYNO))","CREATE TABLE TESTTAB (ACTIVITYNO SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 10 INCREMENT BY 10), ACTKWD CHAR(6) NOT NULL, ACTDESC VARCHAR(20) NOT NULL, UNIQUE(ACTIVITYNO))"] 施工企业定额,亦称施工定额,是进行企业经营和内部()的依据。 ["安全管理","经济核算","质量管理","人事工作"] 移动视频业务是通过移动网络和移动终端为用户提供视频内容的新型通信服务,其主要特征在于传送的内容是比文本、语音更加高级的视频图像(Video),并可以伴有音频(Audio)信息,按所面向的用户,移动视频业务属于()。 ["政企业务","个人业务","家庭业务","公客业务"] An administrator created a .env file in a user's home directory to configure a number of custom environment variables for a local application. However, after the user logs out and then logs back into the system, the custom variables are not being set. What is the most likely reason that the custom .env file is being ignored?() ["A shell other than ksh is being used by the user.","The line 'export ENV=$HOME\/.env' is missing from \/etc\/profile.","The line 'export ENV=$HOME\/.env' is missing from the user's .profile.","The env_profile attribute is not defined for the user within \/etc\/security\/user."] 急性毒性试验的目的是什么?
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