单相全波整流X线机,四个半导体整流器件中有一个断路,摄影曝光时,mA表指数()
A.升高
B.降低
C.无指数
D.减半
E.不变
参考答案:D
Nice to meet you. I’m David Beckham. I’m from England and I’m English. I’m twenty-nine years old. I like playing football and I can play football very well.
My name is Zhou Jielun. I’m from Taiwan, China. I’m thirty years old. I like singing.
My name is Liu Qian. I’m from Taiwan,China. I’m thirty-three years old. I like playing magic cards(魔术牌)
Hello! I’m Li Yuchun. I live in Chengdu now. I’m twenty-five years old. I like singing.
小题1:. Who(谁) is Chinese?
A.Zhou Jielun
B. Liu Qian
C. Li Yuchun
D. A ,B, and C小题2:. Who is the youngest(最年轻的)?
A.Liu Qian
B.Zhou Jielun
C.Li Yuchun
D.David Beckham小题3:________ and ___________ are from Taiwan.
A.Zhou Jielun, Li Yuchun
B.Zhou Jielun , Liu Qian
C.Liu Qian, Li Yuchun
D.Li Yuchun , David Beckham小题4:. David Beckham is __________ years old.
A.twenty-nine
B.twenty-five
C.thirty-three
D.thirty小题5:. David Beckham’s family name is ____and Zhou Jielun’s given name is ____.
A.David , Zhou
B.David, Beckham
C.Beckham, Zhou
D.Beckham, Jielun
在液相液化石油气输送过程中,要求管道中任何一点的压力都要()管道中液化石油气所处温度下的饱和蒸汽压。
A.小于或等于;
B.高于;
C.等于;
D.低于