单项选择题

2砖墙厚的计算厚度是()mm。

A.370
B.490
C.500
D.180

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单项选择题

索引符号圆的线型和直径分别为()

A.粗实线 10
B.细实线 10
C.粗实线 14
D.细实线 14

The government switched one county at a time within states favors researchers because______.
A．it reduced cash payment in Missouri
B．it offered a randomly controlled environment
C．it helped to extend electronic transfers to the state
D．it saw a concurrent decline in crimes

A.
A．it
B.it
C.it
D.it