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【单选题】
( )越高,说明泵与风机的能源利用率越高,其经济性能越好。A.
有效功率
B.
效率
C.
轴功率
D.
转速
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举一反三
【单选题】Did the interviewed Chinese students want to make friends with American students?
A.
No, they didn’t, because there exists great differences between Chinese and American cultures.
B.
No, they didn’t, because many American students segregate themselves from Chinese students by not talking to them.
C.
Yes, they did, although in fact they still had fewer American friends than Chinese ones.
D.
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【单选题】一个初级精母细胞在减数分裂的第一次分裂时，有一对同源染色体不发生分离；所形成的次级精母细胞的第二次分裂正常。另一个初级精母细胞减数分裂的第一次分裂正常，减数第二次分裂时，在两个次级精母细胞中，有一个次级精母细胞的1条染色体的姐妹染色单体没有分开。以上两个初级精母细胞可产生染色体数目不正常的配子（以下简称不正常配子）。上述两个初级精母细胞减数分裂的最终结果应当是
A.
．两者产生的配子全部都不正常
B.
．前者产生一半不正常的配子，后者产生的配子都不正常
C.
．两者都只产生一半不正常的配子
D.
．前者产生的配子都不正常，后者产生一半不正常的配子
【单选题】Chinese Students in the US The 42,503 Chinese students studying in the United States enrolled(注册入学) in 1994 universities. The University of Houston in Texas, with 474 students, or more than one percen...
A.
the university of Houston is the best university in the United States
B.
the University of Houston is the biggest university in the United States
C.
there are about 45,000 students in the University of Houston
D.
the University of Houston only receives Chinese students
【简答题】计算机外围设备分为输入设备和输出设备,手写板是计算机的_____设备.
【单选题】According to the interview, which is NOT the difference between American students and Chinese students?
A.
American students are more willing to speak out and share ideas with other people than Chinese students.
B.
American students are more active than Chinese students.
C.
American students can enjoy much more flexibility of their education than Chinese students.
D.
American students spend more money on their education than Chinese students.
【单选题】The main reason for Chinese students'lack of interaction is that ______.
A.
Chinese students are busy with their study
B.
Chinese students are too shy to communicate with others
C.
the environment is not good for Chinese students
D.
British students only want to make friends among themselves
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