植物来源胡萝卜素的吸收需( )。
A.胃酸
B.胰泌素
C.胆盐
D.肠液的协助
参考答案:C
-- Your shirt wants_______, Mary.
-- Yes, it does. I’m going to have it_______ this afternoon.[ ]
A. to wash, washing
B. to wash, washed
C. washing, washed
D. washing, wash
采用平衡盘为平衡装置的泵适合频繁启、停吗?为什么?