单项选择题
Free communication effect is in direct proportion to（）.
A.length and width of space B.length of space only C.width of space only D.neither length nor width
单项选择题 Electrical wiring on all T-Boats must be（）.
单项选择题 DO NOT，REPEAT，NOT OVER-TAKE means that you should（）.
单项选择题 By regulation，you MUST keep a record of the use of your radiotelephone for at least（）.
