为阻断仲胺和亚硝酸盐合成亚硝胺,应同时给予何种物质()
A.维生素B
B.叶酸
C.维生素B
D.维生素C
E.维生素A
参考答案:D
解析:同时给予维生素C。
— Hello, Mr. Smith. This is Larry Jackson. I am afraid I won't be able to arrive on time for
the meeting in your office.
— ________. We'll wait for you.
[ ]
A. Hurry up
B. No doubt
C. Cheer up
D. That's all right
在如图Ⅱ-3所示的锅炉总图及炉墙总图中,表示入孔的是______。