单项选择题
A.spread B.supplied C.distributed D.spanner
The main （）(保护层) is paint.A. primer boatB. protective c...
单项选择题The main （）(保护层) is paint.
A. primer boat B. protective coat C. top coat D. under coat
The purpose of lookout is to prove the （）(安全) of a ship...
单项选择题The purpose of lookout is to prove the （）(安全) of a ship.
A.stern B.safety C.saw D.spanner
Where is the （）(撬棍)？A.hacksawB.needleC.crowbarD.hammer
单项选择题Where is the （）(撬棍)？
A.hacksaw B.needle C.crowbar D.hammer
