土石坝在料场规划中，用料时原则上应( )。 A．低料低用 B．

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问题多项选择题

土石坝在料场规划中，用料时原则上应( )。

A．低料低用

B．高料高用

C．高低料混用

D．低料场储料有富余时，应该低料高用

E．高料场储料有富余时，也可高料低用

答案

参考答案：A,B,E

选择题

If law and order as well as rules and regulations _____, neither the citizen nor his property is safe.[ ]

A. are not observed

B. is not observed

C. were not observed

D. was not observed

判断题

LD₅₀是衡量药物毒性大小的重要指标，LD₅₀愈大，药物毒性愈大。