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【单选题】
Although the mechanical efficiency is lower, the ( ) are quieter and any damage resulting from a bad gear change occurs to the dog teeth instead of the actual gear.A.
helical gears
B.
spur gears
C.
bevel gears
D.
cylindrical gear
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举一反三
【单选题】One of the disadvantages of whole-class grouping is that...
A.
It allows the students to interact with all other class members.
B.
It allows the teacher to control the class as a whole.
C.
It can reduce student talk time.
D.
It can reduce the teacher’s organizational time.
E.
It provides fewer chances for one student to answer all the questions.
【简答题】在题如图所示电路中，R 1 =R 2 =150Ω，L=100mH，C=10μF，ω=500tad/s，已知电流为 求a、b间的端电压U和电路的总功率P，并写出电压的瞬时值函数式。
【单选题】She was the one in the whole class who was eligible to apply for the scholarship.
A.
competitive
B.
diligent
C.
qualified
D.
competent
【单选题】Not only the teacher but also the whole class _____ to the report at this time yesterday. [ ]
A.
listened
B.
was listening
C.
were listening
D.
has listened
【判断题】根据《旅游安全管理办法》规定，旅游经营者应当依法制定旅游突发事件应急预案，与所在地省级以上地方人民政府及其相关部门的应急预案相衔接，并定期组织演练。( )
A.
正确
B.
错误
【简答题】在如图所示的电路中,已知 E 1 =E 2 =10V , R 1 =R 2 =1 Ω , R 3 =2 Ω , 应用叠加原理求通过负载 R 的电流为多大?
【单选题】Which of the following shows the structure of the whole text?
A.
power and class do not always correspond with each other
B.
status refers to a person’s economic position in society
C.
people with high status have a lot of control over others
D.
class is less important in deciding a person’s social rank
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