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【单选题】
What is the main message of the news item?A.
President Obama is about to sign a treaty with Russia.
B.
America is working to control the spread of nuclear weapons.
C.
5 billion dollars are invested on extending the life of weapons.
D.
40 countries are about to attend the meeting on nuclear security.
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【简答题】已知程序中有声明“int a;long b;”,若需要接收从键盘输入的电话号码字符串(025)45654324(其中025是区号,45654324是电话号码)并将其中的区号、电话号码分别存储到变量a、b中,则实现该功能的输入语句应为“scanf(”_____",&a,&b);"。
【简答题】已知程序中有以下声明： int nonconst_var = 100; const int const_var1 = 2; const int const_var2 = nonconst_var; 则下述代码中正确的是：
【多选题】What's the difference between signal wayside safety relay and nomal relay?
A.
signal safety relay use gravity principle.
B.
if safety relay failure ,front contact close.
C.
we can use normal relay to replace safety relay.
D.
safety relay have large volume.
E.
onborad signal equipment can use wayside safety relay.
【简答题】社会心理学家欧文 . 戈夫曼认为人的社会交往是一个()的过程。
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