氨氧化催化剂金属铂为不活泼金属,因此硝酸生产中,铂网可以放心使用,不会损坏。
参考答案:错
—_____ the weather _____ today?
—It's very cold. [ ]
A. What's; like
B. How's; like
C. What's; /
D. What; like
我国青藏高原年太阳辐射总量最多的主要原因是 [ ]
A.纬度低
B.海拔高,晴天多
C.气温高
D.白昼长