单项选择题
A.in duplicate
B.in double
C.at twice
D.for two
单项选择题 Please draw out a 0l mm shim between the two halves of the bearing （） the clearance.
单项选择题 Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.
单项选择题 Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.