單項選擇題The piston rings if found worn out （） and supplied by shipchandler.

A.must replace
B.must to be equipped
C.has to be repaired
D.have to be renewed


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題The piston rings are manufactured with a diameter （） the bore of the cylinder.

A.larger than
B.smaller than
C.equal to
D.none of the above

2.單項選擇題The piston ring grooves for a standard engine are （）

A.chromium-plate against wear
B.anti-corrosion treated
C.white metal lined against wear
D.flame hardened against wear

3.單項選擇題The piston moving up and down keeps the crankshaft （）.

A.to revolve
B.revolved
C.revolving
D.to be revolved

4.單項選擇題The piston moves up and down, thus causing the rotational movement of the（）

A.crankshaft
B.connecting rod
C.cross-head
D.main beating

5.單項選擇題The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.

A.doesnt use a drain tank but a head tank
B.uses a drain tank not head tank
C.uses a drain tank and a head tank
D.uses neither a drain tank nor a head tank