旋回直径约为旋回初径的:() ["0.5倍","0.6倍","0.9~1.2倍","0.6~1.2倍"]
SS-46型双向测振仪,振动大时有输出,微弱振动时无输出,原因是()。 ["A、拾振器线圈断路;","B、拾振器线圈短路;","C、拾振器线圈和磁钢间有磨擦现象;","D、拾振器线圈松。"]
现金结算的规定是什么?
氨基甙类抗生素不包括() ["A.链霉素","B.克林霉素","C.庆大霉素","D.螺旋霉素"]
一般商船旋回时其转心约在首柱后()船长处。 ["1/2~1/3","1/3~1/5","1/5~1/6","1/6~1/3"]
祭奠性殡葬用品有哪些?请试举几例说明。