若一个三角形的三个内角互不相等，则它的最小角必小于[      ]

A.30°

B.45°

C.60°

D.55°

A well in the uppermost deck of a shelter deck vessel which has only a temporary means of closing for the purpose of gaining an exemption from tonnage measurement is called a（n）（）.

A.Exemption space

B.Tonnage deck

C.Cofferdam

D.Tonnage opening