单项选择题
The total berth time for a vessel can be reduced through a reduction（）.
A.of working gangs B.of idle time C.in productivity of the working shifts D.of working hours each working day
单项选择题 The transportation of dangerous cargo in packages is governed by（）.
单项选择题 The use of（）between bags may lead to chafage and tearing of the bags.
单项选择题 The valves（）S/0 No.187 is not shown in the plan.
