以下元素符号中正确的是 ( )
A.钠元素:NA
B.铝元素:Al
C.汞元素:HG
D.硅元素:SI
答案:B
H2/N2()会造成氨合成反应床温下降。
A、过高
B、正常
C、无影响
D、过低
—How do you find your new classmates —Most of them are kind,but()is SO good to me as Bruce.
A.no Be
B.no one
C.every one
D.some one