标注坡度时,箭头应指向()方向。
A、上坡
B、下坡
C、前方
D、根据需要确定
参考答案:B
Nowadays we are often filled with some apparently _______ suggestions made by so-called experts on
how to keep in good health. [ ]
A. appropriate
B. aggressive
C. concrete
D. contradictory
乙型肝炎传给婴儿的主要方式是:
A.粪-口传染B.注射血浆制品C.输血D.母婴垂直传播E.密切生活接触