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【单选题】
用N A 表示加德罗常数的值,下列叙述中不正确的是(  ) ①12.4g白磷晶体中含有的P-P键数约是0.6N A ; ②电解精炼铜时转移了N A 个电子,阳极溶解32g铜; ③7.8g Na 2 S和Na 2 O 2 的混合物中含有的阴离子数大于0.1N A ; ④2mol SO 2 和1mol O 2 混合在V 2 O 5 存在的条件下于密闭容器中加热反应后,容器内物质分子数大于2N A ; ⑤2.9g 2CaSO 4 ?H 2 O含有的结晶水分子数为0.02N A (2CaSO 4 ?H 2 O式量为290); ⑥含0.2mol H 2 SO 4 的浓硫酸与足量铜反应,生成SO 2 的分子数为0.1N A ; ⑦含0.1mol溶质Na 2 CO 3 的溶液中,所含阴离子总数大于0.1N A .
A.
①②③④⑤⑦
B.
②③⑤⑥
C.
①③④⑤⑥
D.
③④⑤⑥⑦
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【简答题】已知复数z 1 =3+4i,z 2 的平方根是2+3i,且函数 f(x)= 2x x+1 . (1)求 f( . z 1 + z 2 ) ; (2)若f(z)=1+i,求z.
【简答题】求由下列条件确定解析函数f(z)=u+iv (1)u=x 2 +xy-y 2 ,f(i)=-1+i; (2)v=e x (ycosy+xsiny),f(0)=0
【单选题】What devices are used to enter information into the system?
A.
RAMs
B.
Projections
C.
Output devices
D.
Input devices
【多选题】Rhetorical devices fall into three classifications, namely _________________, _________________, ___________________.
A.
phonetic devices
B.
lexical devices
C.
syntactic devices
D.
grammatical devices
【简答题】如果f(z)=u+iv是z的解析函数,证明
【简答题】求k值,使u=x 2 +ky 2 为调和函数,再求u的共轭调和函数v.使解析函数f(z)=u+iv满足f(i)=-1
【单选题】甲注册会计师事务所为一般纳税人,2018年8月,甲会计师事务所提供取得鉴证咨询服务取得收入500万元(不含增值税);出租2016年10月购入的 不动产,当月取得现金收入200万元(不含增值税),已知:甲会计师事务所对不同类别的销售额分别核算。则该事务所当月应纳增值税销项税额为( )万元。
A.
70
B.
42
C.
62
D.
50
【简答题】已知函数,f(x)=x 3 -ax 2 -9x+11且f′(1)=-12. (I)求函数f(x)的解析式; (II)求函数f(x)的极值.
【单选题】Consider the following command to add a new disk group called "tdgroupA" with two failover groups: CREATE DISKGROUP tdgroupA NORMAL REDUNDANCY FAILOVERGROUP control01 DISK ’/devices/A1’,  ’/devices/A2...
A.
This command would result in an error because a disk group can have only one failover group.
B.
This command would result in an error because the /devices/A1 disk is a member of another disk group tdgroup1.
C.
A new disk group called tdgroupA will be added with two failover groups and the /devices/A1 disk will get reattached to the new disk group without being detached from the existing one.
D.
A new disk group called tdgroupA will be added with two failover groups and the /devices/A1 disk will be ignored for the new disk group because it is a member of an existing disk group tdgroup1.
E.
A new disk group called tdgroupA will be added with two failover groups and the /devices/A1 disk gets detached from the existing disk group tdgroup1 and attached to the new disk group tdgroupA
【单选题】You have configured the ASM instance for the PROD database of iPod Corporation. You have specified the following parameter values in the initialization parameter file:   DB_CREATE_FILE_DEST=’devices/g...
A.
Both the members will be stored in the ’devices/grp1/P’ directory.
B.
Both the members will be stored in the ’devices/d_grp2/Q’ directory.
C.
Both the members will be stored in the ’devices/d_grp3/R’ directory.
D.
One member will be stored in the ’devices/d_grp2/Q’ directory and the other in the ’devices/d_grp3/R’ directory.
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