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【单选题】
It's so kind of you to help us. Without your help, we couldn't have finished the work___________. [ ]A.
in a time
B.
at no time
C.
ahead of time
D.
behind time
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反馈参考答案：
举一反三
【简答题】可变进气歧管可根据( )和( )的变化,通过电脑控制而自动改变,在所有转速下都可使发动机的转矩平均提高8%。
【单选题】--Mary, where’s Simon? I haven’t seen him for days. --He __________ Japan. This may be the third time he _________ there.
A.
has been to, has gone to
B.
has been to, has gone
C.
has gone to, has been to
D.
has gone to, has been
【单选题】— Hello! May I speak to Tom? — Sorry, he isn't in. ______________? [ ]
A.
Who are you
B.
Who's this
C.
Who's that
D.
What is it
【单选题】在采用可变进气歧管有效长度的汽油发动机中, 电控系统根据汽油发动机的运行工况,在低速运转时,控制阀关闭,使进气歧管( ),可增加进气的速度和压力,使进气更充分。
A.
变短
B.
变长
C.
没有变化
D.
都有可能
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