甲板机械执行机构动作不平稳一般不会是因为()
A.气穴现象
B.油马达爬行现象
C.负载过重
D.油马达内部局部损坏
参考答案:C
沙门菌食物中毒的主要传染源是()
A.家畜、家禽
B.海产品
C.人的化脓性伤口
D.苍蝇
E.尘埃
Lisa is as _______ as Nancy. They are good friends. [ ]
A. outgoing
B. more outgoing
C. the most outgoing
D. much outgoing