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【多选题】
电气安全用具包括( )A.
绝缘棒
B.
绝缘安全用具
C.
绝缘手套
D.
一般防护用具
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反馈参考答案：
举一反三
【单选题】Which statement is false?
A.
A compound statement may contain definitions.
B.
A block may optionally contain definitions.
C.
A block that contains definitions can be used anywhere that a compound statement can be used.
D.
A compound statement that contains definitions is called a block
【单选题】Which statement is true?
A.
Assigning a value to a symbolic constant in an executable statement is a syntax error.
B.
A symbolic constant is a variable.
C.
Space is reserved for a symbolic constant as with variables that hold values at execution time.
D.
Only uppercase letters can be used for symbolic constant names.
【单选题】Which statement is FALSE?
A.
Collagen is a protein in which the polypeptides are mainly in the a -helix conformation.
B.
Disulfide linkages are important for keratin structure.
C.
Gly residues are particularly abundant in collagen.
D.
Silk fibroin is a protein in which the polypeptide is almost entirely in the b conformation.
E.
a -keratin is a protein in which the polypeptides are mainly in the a -helix conformation.
【单选题】数字信号的特点是
A.
在时间上和幅值上都是连续的。
B.
在时间上是离散的,在幅值上是连续的。
C.
在时间上是连续的,在幅值上是离散的。
D.
在时间上和幅值上都是不连续的。
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