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【单选题】
What is the purpose of a comment statement in a program?A.
It provides documentation for the user so that they can use the program effectively.
B.
It provides instructions for the compiler to include header files needed to translate the program to machine language.
C.
It specifies an instruction to be executed when the program runs.
D.
It allows the programmer to make notes during program development that can be removed when the program is complete.
E.
It provides documentation for programmers so that they can understand what the program does when it runs.
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【单选题】已知两正弦电流 i 1 =220 √2 sin (314t)A,i 2 =220√2 sin (314t—120 O )A,试写出二者之和的幅值相量 的表达式:( )。
A.
220 √2∠120°A
B.
220 ∠120°A
C.
220 √2∠-60°A
D.
220 ∠-60°A
【简答题】三仁汤原方中用甘澜水煎药，意以（）
【简答题】国库单一账户是在人民银行开设的国库存款账户，它与财政零余额账户、单位预算内零余额账户和特设专户进行清算，实现财政国库集中支付。（ ）
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