单项选择题
Timber can be stowed （）.
A. only on deck B. only in holds C. both on deck and in holds D. All above.
单项选择题 The derrick is too high.（）it, please.
单项选择题 The derrick is too low. （）it, please.
单项选择题 Before the（）of the derrick, check all the tackle closely.
