空腔脏器痉挛性疼痛表现为（）
A.酸痛
B.胀痛
C.绞痛
D.放射痛
E.风湿痛
参考答案：C
《城市区域环境噪声标准》（GB3096-2008）规定的3类标准昼间为（）DB。
A、50
B、55
C、60
D、65
The most variable factor in the control of broken stowage is（）.
A.the use of excessive amounts of dunnage
B.the use of excessive amount of filler cargo
C.the failure to stow some item in neat and uniform rows and tiers
D.the skill, industry and interest of the longshoremen
