客船上每一动力滑动水密门的最大净开口宽度一般应限制为：（）
A.1.2m
B.1.5m
C.1.8m
D.2.0m
参考答案：A
单句改错（共5小题，每小题1分，共 5分。每句只能改一处,在原句中直接改正）
小题1:Air hostesses all smile when they serve for the passengers.
小题2:No one matches him when it comes to swim.
小题3:A poor nourished body needs more energy to combat disease.
小题4:Foreigners always associate China to the Great Wall.
小题5:Not until then he realize the importance of the problem.
煤堆上采样，采样点如何分布？深度应为多少？
