题目内容

The entire morale among the employees in Factory B _______ until now ever since the introduction of our new flexible working hour system.

A. were boosted
B. had been boosted
C. boosting
D. has been boosted

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The conference organizer has ______about the agenda but cannot provide help for hotel reservations.

A. inform
B. informed
C. to inform
D. information

设(X1，X2，…，Xn)是来自正态总体N(μ，σ2)的简单随机样本，其中参数μ，σ2未知，则下列各项中，不是统计量的有()。

回弹测点不应在气孔或外露石子上，距外露钢筋预埋件的距离不宜小于30mm。()

A. 正确
B. 错误

当混凝土构件强度大于50MPa时，可采用标准能量大于2.207J的混凝土回弹仪，并用专用测强曲线进行检测。()

A. 正确
B. 错误