“合同协议号”栏应填( )。
A.CU-151312
B.SSKG29179
C.90039020
D.4402191616
参考答案:A
根据句意用括号内所给词的正确形式填空:
1. My parents often tell me to listen to the teacher_______ (careful).
2. Every year, many_______ (visit) come to China to climb the Great Wall.
3. My brother is old enough to take care of _______ (he).
4. What's your _______ (weigh), Kate? Oh, it's a secret.
5. People can't live _______ (with) air or water.
通常情况下,原子核外p能级、d能级等原子轨道上电子排布为“全空”、“半满”、“全满”的时候一般更加稳定,称为洪特规则的特例。下列事实能作为这个规则证据的是
A、元素氦(He)的第一电离能远大于元素氢(H)的第一电离能
B、26Fe2+容易失电子转变成26Fe3+,表现出较强的还原性
C、基态铜(Cu)原子的电子排布式为[Ar]3d104s1而不是[Ar]3d94s2
D、某种激发态碳(C)原子排布式为1s22s12p3而不是1s22s22p2