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问题 单项选择题 B型题

乙肝疫苗开始接种的时间是（）

A.新生儿

B.2个月

C.3个月

D.8个月

E.4岁

答案

参考答案：A

解析：根据小儿免疫程序，脊髓灰质炎疫苗第一次接种时间为2个月，乙肝疫苗第一次接种时间为出生后24小时内，麻疹疫苗第一次接种时间为8个月。

单项选择题

Although your internet start-up company has few project management policies and procedures in place, it made a healthy profit last year. Experience, however, has taught you that some controls are required, especially for projects that change frequently. You would like to establish a change control system for your company, but must convince a group of money-hungry “20 somethings” to use it. To be effective, the change control system must include （）.

A．procedures that define how project documents may be changed

B．specific change requests expected on the project and plan to respond to each one

C．performance reports that forecast project changes

D．a description of the functional and physical characteristics of an item or system
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单项选择题

某场地中淤泥质黏土厚15m，下为不透水土层，该淤泥质黏土层固结系数Ch＝Cv＝2.0×10-3cm/s，拟采用大面积堆载预压法加固，采用袋装砂井排水，井径为dw＝70mm，砂井按等边三角形布置，井距s＝1.4m，井深度15m，预压荷载P＝60kPa；一次匀速施加，时间为12天，开始加荷后100天，平均固结度接近（）。（按《建筑地基处理技术规范》（JGJ79—2002）计算）

A.0.80

B.0.85

C.0.90

D.0.95
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