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【单选题】
下列关于 随机误差的主要评价指标的说法有误 的是 () 。A.
在消除了系统误差的条件下，可用一系列测得值的算术平均值代替真值
B.
评定随机误差时以±3σ作为单次测量的极限误差
C.
标准偏差能反映分布曲线的形状，但不能反映测量精度的高低
D.
当测量次数n增大时，算术平均值愈趋于真值
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【单选题】China is also a world leading absorber of FDI. P resently more than ( ) of the annual FDI that China receives goes into the country ’ s services sectors.
A.
50 percent
B.
60 percent
C.
70 percent
D.
80 percent
【简答题】选取典型案例,划分小组,分析我国在食品安全上发生过的事件,归纳事件的起因、经过、处理措施。
【单选题】The annual report summarizes the ______technical support service to estimate the cost of providing it.
A.
proposed
B.
to proposing
C.
propose
D.
proposes
【简答题】Important Notice! Please be advised: the annual testing of the building’s fire and life safety system will be conducted on Wednesday, December 7, 2016 between 8:00 a. m. —5:00 p.m.
【简答题】The annual p_______ on my policy is $150.
【单选题】The annual conference ( ) in our school library at 3:00 p.m. next Tuesday May 22.
A.
will be held
B.
will hold
C.
will be hold
D.
is held
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