热原的主要成分是
A.蛋白质
B.胆固醇
C.脂多糖
D.磷脂
E.生物激素
参考答案:C
She attended some courses, including typing and book-keeping, because she was ______ to get a good job.
A.confident
B.skilful
C.fortunate
D.keen
HLM—S60型滑块卡瓦打捞矛为()打捞矛。
A.双滑块
B.单滑块
C.三滑块
D.有水眼