润滑油品的老化和变质可以用水份及杂质取一定试样的油品沉淀后与合格油品进行比较,看试样下面是否有()沉淀析出。
A、水珠及杂质
B、油珠
C、粉末
D、润滑油
参考答案:A
—It is important for you to findappropriate course at college.
—I can't agree more. It's decision that affects the whole family.
A. the, the
B. an, the
C. an, a
D. the, a
在实施三级防备时,重点在第一级防备,同时兼顾二三级防备的疾病是:
A.急性阑尾炎
B.流行性感冒
C.食物中毒
D.冠心病
E.肺炎