单项选择题
A.are made of B.are made from C.make use of D.are used to
Measure （） by means of lead wire.A.the clearance of the...
单项选择题Measure （） by means of lead wire.
A.the clearance of the main bearing B.the diameter of main bearing C.the hardness of main bearing D.the tolerance of main bearing
A.the clearance of the main bearing B.the play of the miler bearing C.the gap of the main bearing D.the tolerance of the main bearing
Marine four-stroke diesel engines are mainly （）.A.of cr...
单项选择题Marine four-stroke diesel engines are mainly （）.
A.of crosshead type B.of trunk piston type C.of low speed type D.all the above
