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【单选题】
影响疲劳的因素有：I、心理紧张、情绪不佳；II、身体较弱；III、技术不熟练A.
I
B.
I、II
C.
I、II、III
D.
II、III
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【简答题】某车间同时运转10台机器，各台机器独立工作，每台机器出故障的概率为0.2，每台机器出故障时，只需一人维修，现配有2个维修工．问：机器出故障时得不到及时维修的概率是多少?
【简答题】The _____(discuss) is very hot. H e is _____(friend) to all of us. This is an ____(难忘的) holiday. He was attracted by the girl's _____(美丽) It is _____(harm) to smoke for young people. A lot of people t...
【单选题】What can we learn from the story?
A.
The girl's aunt got the news about the finding of a girl in the newspaper.
B.
Mrs Ruth Li's daughter was too young to speak.
C.
Mrs Ruth Li's sister made a long voyage to New York and recognized the girl.
【单选题】已知氢硫酸的 K 1 = 9.1 ́ 10 -8 、 K 2 = 1.1 ́ 10 -12 , 将硫化氢通入 [H + ] = 0.1 mol / L的溶液中达到饱和,此时溶液中 [S 2- ] 为( )。
A.
1.1 × 10 -12 mol / L
B.
1× 10 -18 mol / L
C.
0.05 mol / L
D.
1 × 10 -17 mol / L
【单选题】下列实验过程中产生的现象与对应的图形相符合的是（ ）
A.
NaOH溶液滴入AlCl 3 溶液中
B.
SO 2 通入氢硫酸中
C.
H 2 S通入NaOH溶液中
D.
CO 2 通入饱和Na 2 CO 3 溶液中
【单选题】机器损坏保险的费率是根据()来确定的。
A.
每一台机器的历史损失率
B.
每一台机器不同类型与用途
C.
每一台机器以往几年的损失率和不同类型与用途
D.
历史损失数据
【简答题】听下面一段材料，回答1-3题。 1. Where does the girl's uncle work? A. In a school. B. On a farm. C. In a factory. 2. Why did Mr. Gao leave school when he was young? A. His father was ill. B. He was ill. C. His fami...
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