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【单选题】
发现胀轨跑道且无降温条件或降温无效时,应立即截断钢轨(普通线路应拆开钢轨接头)放散应力,整正线路,夯拍道床,首列放行列车速度不得超过( ),并派专人看守、整修线路,逐步提高行车速度。
A.
5km/h
B.
10km/h
C.
15km/h
D.
20km/h
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【单选题】40W,60W和100W三只灯泡串联接在220V的电源上,灯的额定电压220V,它们的发热量由大到小排列为()。
A.
100W、60W和40W
B.
40W、60W和100W
C.
100W、40W和60W
D.
60W、100W和40W
【单选题】In his ______to further his knowledge of the universe, man has now begun to explore space.
A.
endeavor
B.
expedition
C.
trail
D.
chase
【单选题】抽取一个容量为100的随机样本,其均值为 =81,标准差s=12。总体均值μ的95%的置信区间为( )。
A.
81±1.97
B.
81±2.35
C.
81+3.10
D.
81±3.52
【简答题】_____ his knowledge of the mountainous country, JohnSmith was appointed as our guide. A. In spite of      B. On account of C. Regardless of    D. Instead of
【单选题】额定电压都为220V的40W、60W和100W三只灯泡串联在220V的电源中,它们的发热量由大到小排列为( )。
A.
100W,60W,40W
B.
40W,60W,100W
C.
100W,40W,60W
D.
60W,100W,40W
【单选题】In his ______ to further his knowledge of the universe, man has now begun to explore space.
A.
attempt
B.
expedition
C.
trial
D.
chase
【单选题】抽取一个容量为100的随机样本,其均值为 81,标准差为12。总体均值的99%置信区间为
A.
81±1.97
B.
81±2.35
C.
81±3.1
D.
81±3.52
【单选题】抽取一个容量为100的随机样本,其均值为 =81,标准差s=12。总体均值μ的99%的置信区间为( )。
A.
81±1.97
B.
81±2.35
C.
81±3.10
D.
81±3.52
【单选题】额定电压都为220V的40W、60W 和100W三只灯泡串联接在220V的电源中,它们的发热量由大到小排列为( )。
A.
100W,60W,40W
B.
40W,60W,100W
C.
100W,4OW,60W
D.
60W,100W,40W
【判断题】Cao Xueqin, the author of The Dream of the Red Chamber, revealed his knowledge of and insight into tea, as well as his knowledge of the tea-drinking customs of the Ming Dynasty.
A.
正确
B.
错误
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