社区服务与社会实践活动课程是必修的学习领域，学校不能灵活使用基本的课时。
查看答案
If the cargo gear on your vessel is equipped with a regular guy and a preventer guy，you should（）.
A. let the schooner guy take most of the strain，thus transferring the load to the opposite boom
B. leave the preventer guy slack
C. secure them as close together as possible on deck
D. secure them so the angle between them is 90°at the boom head
独立点火与同时点火相比，省去了（）。
A. 点火器
B. 高压线
C. 火花塞
D. 传感器
微信支付 
支付宝支付