某建筑场地抗震设防烈度为7度，地基设计基本地震加速度为0.15g，设计地震分组为二组，地下水位埋深2.0m，未打桩前的液化判别等级如表，采用打入式混凝土预制桩，桩截面为400mm×400mm，桩长l＝15m，桩间距s＝1.6m，桩数20×20根置换率ρ＝0.063，打桩后液化指数由原来的12.9降为()。
A. 2.7
B. 4.5
C. 6.8
D. 8.0
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2005年第三季度，农村居民人均现金收入约为()(元)。
A. 4200
B. 2600
C. 6510
D. 3102
农村居民人均现金收入同比增长最低的是()。
A. 2003年2季度
B. 2004年4季度
C. 2004年1季度
D. 2005年1季度
A．She was once an Assistant U.S. Attorney.B．She was once a prosecutor working for the
A. She was once an Assistant U.S. Attorney.
B. She was once a prosecutor working for the state government.
C. She was once a member of the jury in charge of the indictment.
D. She was working for the state government the conspiracy was started.
It can be inferred that which of the following is true of plant fecundity as it is defined
A plant's fecundity decreases as the percentage of unpollinated flowers on the plant increases.
B. A plant's fecundity decreases as the number of flowers produced by the plant decreases.
C. A plant's fecundity increases as the number of flowers produced by the plant increases.
D. A plant's fecundity is usually low if the plant relies on a small number of insect species for pollinations
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