更多"[单选题]According to the passage,in a "的相关试题:
[单选题] Coins were given value according to the exact amount of metals contained in them __________.
A. between the eighteenth and nineteenth centuries
B. after the eighteenth and nineteenth centuries
C. during the eighteenth and nineteenth centuries
D. before the eighteenth and nineteenth centuries
[单选题]According to the insurance company, by buying Home Solutions,you can get help ___ .
A.when your vehicle breaks down on your way to work.
B.when something unexpected happens to your home.
C.when anyone in your family gets hurt or sick.
D.when you want to move to a new house
[简答题]According to the report,the North American health market (grow)____at a rate of about 7.4% in 2017.（5.0）
[简答题]According to the company's policy,employees(allow)____to use their cell phones only
In emergency.（5.0）
[填空题] According to the text, Li Na seems to be happy both on and ( )__the court.
[判断题]常用安全电压由：42V、36V、24V、12V、6V。
A.正确
B.错误
[判断题]常用安全电压有:42V、36V、24V、12V、6V。( )
A.正确
B.错误
[判断题]我国规定6V.12V.24V.36V.42V为安全电压。( )
A.正确
B.错误
[判断题]我国安全电压有6V.12V.24V.36V.42V五个等级。
A.正确
B.错误
[判断题]我国现行的安全电压额定值的等级为:48V、34V、24V、12V和8V。
A.正确
B.错误
[单选题]启动器吸引线圈额定电压为交流( )：24V、48V、110V、220V、380V。
A.30Hz
B.40Hz
C.50Hz
D.60Hz
[判断题]我国安全电压额定值的等级分别为42V、36V、24V、12V、6V。( )
A.正确
B.错误
[简答题]LKJ的电源插件的输入电压为（ ）V，输出电压为5V、±12V、24V、15V。
[填空题]如图所示电路，V1V4间电源电压为9V，V2V3间电源电压为3V，R1=4Ω、R2=2Ω，忽略电源内阻，则V1V3间电压为（Q）V。
[判断题]我国安全电压有6V.12V.24V.36V四个等级。
A.正确
B.错误
[判断题]根据中国的具体条件和环境，我国规定的安全电压等级共有42V、36V、和24V、12V、6V等五个等级
A.正确
B.错误
[填空题]施工照明的安全电压是( )V、( )V、( )V、( )V
[单选题]我国现行的安全电压额定值的等级为：42V、36V、24V、12V和6V。一般性的规定是：在干燥的情况下，安全电压（ ）。
A.42V
B.36V
C.24V
D.12V
