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【单选题】
三相异步电动机采用Y-Δ降压启动时，启动电流是Δ接法全压起动时的( )A.
√3/3
B.
√3
C.
3
D.
三分之一
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【简答题】柚木实心地板,规格为910毫米*122毫米*18毫米
【单选题】Which of the following best expresses the essential information in the highlighted sentence? Incorrect answer choices change the meaning in important ways or leave out essential information.
A.
Modern empiricism attempts to invent a theory of the whole universe.
B.
Modern empiricism attempts to build a system of philosophies.
C.
Modern empiricism attempts to tackle certain problems one at a time.
D.
Modern empiricism attempts to develop a powerful logical techniqu
【简答题】柚木实心地板,规格为910毫米*122毫米*18毫米
【简答题】According to Yosma, what don't teachers do in happiness classes?
【单选题】Which of the following best expresses the essential information in the highlighted sentence? Incorrect answer choices change the meaning in important ways or leave out essential information.
A.
President Hoover did no recognize the seriousness of the situation right away, and did not offer relief to the poverty- stricken citizens when he should have.
B.
President Hoover thought that the Great Depression was a mere passing incident in the history, and believed that things will take a better turn within two months.
C.
President Hoover did not offer relief to the poverty-stricken because he believed in individualism, and also assumed that the depression would not last long.
D.
President Hoover saw that the country's economy was in danger, but his firm belief in individualism prevented him from providing help to those in need of a relief.
【单选题】设m=3i+5j+8k,n=2i-4j-7k,p=5i+j-4k,若a=4m+3n-p,则向量a 在x轴上的投影和在 y轴上的分向量分别是
A.
13i，7j
B.
13i，7
C.
13，7j
D.
13，7
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