油泵一般不得用()传动,最好用电动机直接传动。
A.齿轮
B.链
C.V带
D.蜗杆
参考答案:C
用单词的适当形式填空。
1. What's ________ with your dog?
2. What's ________ matter with your bike?
3. He said that he ________ (wash) his wound first tomorrow.
4. Don't worry. You ________ (be) all right soon.
5. The doctor said I needed ________ (give) a shot.
骨髓增生极度活跃,以中性中幼粒细胞以下阶段为主,嗜酸性细胞和嗜碱性细胞易见()。
A.慢性粒细胞白血病
B.骨髓增生异常综合征
C.急性白血病
D.类白血病反应
E.慢性淋巴细胞白血病