循环水装置检修后投用前首先要进行系统清洗和()。
参考答案:预膜
I got to the office earlier that day,________the 7∶30 train from Paddington.
(2013·大纲全国,25)
A.caught
B.to have caught
C.to catch
D.having caught
对于术前营养状况良好的患者,水溶性维生素的补充量应该是正常需要量的()
A.2~3倍
B.3~4倍
C.4~5倍
D.5~6倍
E.6~7倍