当管螺纹和梯形螺纹为左旋时,需在尺寸规格之后加注()。
A.L
B.R
C.LH
D.RH
参考答案:C
阅读下面材料,从每题所给的A、B、C、D四个选项中选出最佳答案。
A
小题1: “Three Little Cows” is ___________.
A.the name of a zoo
B.the name of a movie
C.the name of a restaurant
D.the name of a party小题2: When are great drink specials and half price pizza offered?
A.On Monday and Friday, 3-6 pm.
B.From Monday to Friday, 3-6 pm.
C.On Wednesday, 6-10 pm.
D.At any time.小题3: From 6 pm to 10 pm on Wednesday, customers can __________.
A.have free wine
B.make a bottle of wine
C.pay $10 less for the wine
D.have wine for only $10
美国的总统制是( )。
A.首长制
B.委员制
C.完整制
D.集权制