做真空严密性试验时,如果机组真空下降较快,应立即停止试验,恢复原来的运行状态()
参考答案:对
根据句意从方框中选择合适的单词,并用其适当形式完成句子。(5分)
小题1:Alice is than her sister.
小题2:What can we do to the environment around us?
小题3:We do the shopping every Sunday.
小题4:I with Lucy on many things though we’re good friends.
小题5:I have many , such as playing the guitar and growing flowers.
再生障碍性贫血骨髓组织中明显减少或无的细胞是()
A.淋巴细胞
B.浆细胞
C.组织嗜碱细胞
D.巨核细胞
E.网状细胞