乳化液泵的曲轴是三拐曲轴，由优质（）钢锻制而成
A.40Gr
B.40Co
C.40Mn
D.40Mi
参考答案：A
将十进制数56转化为二进制数（ ）．
Henry failed in the game, but he looked ______ nothing had happened. [ ]
A. even if
B. as if
C. such as
D. ever since
