Na与H2O反应现象明显，下列现象中不能观察到的是[ ]
A．Na浮在水面上
B．Na在水面上游动
C．Na沉在水下
D．Na熔成光亮小球
答案：C
The plane was circling over the landing field for 15 minutes when the pilot was told that he should use the Westside Field.
A．is
B．would be
C．has been
D．had been
项目投入总资金由( )两项构成。
A．建设工程费和流动资金
B．静态投资和流动资金
C．建设投资和流动资金
D．建设投资和建设期利息
