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【单选题】
下列关于核酸结构的叙述错误的是
A.
双螺旋表面有大沟和小沟
B.
双螺旋结构中上、下碱基间存在碱基堆积力
C.
双螺旋结构也存在于RNA分子中
D.
双螺旋结构仅存在于DNA分子中
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参考答案:
举一反三
【单选题】以下哪个命令不能调整图像色彩?( )
A.
亮度/对比度
B.
可选颜色
C.
色彩平衡
D.
色相/饱和度
【单选题】阈值是对所探测的火灾参数设定固定值,发生火情后,该参数( ),一旦达到阈值便发出一个阶跃开关量信号,并由此驱动报警系统。
A.
变大
B.
变小
C.
不变
D.
无法判断
【单选题】一般主张应在生后多久开始添加辅食:
A.
2月
B.
3月
C.
4-5月
D.
6月
E.
以上都不对
【单选题】A Windows Communication Foundation (WCF) service has a callback contract. You are developing a client application that will call this service.You must ensure that the client application can interact w...
A.
On the OperationContractAttribute, set the AsyncPattern property value to true.
B.
On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
C.
On the client, create a proxy derived from DuplexClientBase .
D.
On the client, use GetCallbackChannel .
【单选题】阈值是对所探测的火灾参数设定固定值,发生火情后,该参数逐渐__,一旦达到阈值便发出一个阶跃开关量信号,并由此驱动报警系统。
A.
不变
B.
变小
C.
变大
D.
无法判断
【单选题】A Windows Communication Foundation (WCF) service is deployed with netTcpBinding. This service uses a duplex message exchange pattern.You are developing the next version of the WCF service. You discove...
A.
Use basicHttpBinding.
B.
Create a custom binding that has the compositeDuplex, textMessageEncoding, and namedPipeTransport binding elements in this order.
C.
Create a custom binding that has the compositeDuplex, textMessageEncoding, and wsHttpTransport binding elements in this order.
D.
Use wsHttpBinding.
【简答题】用高锰酸钾法测定锰矿石中的锰含量。称取均匀锰矿石样品0.5000g,加入0.8500g纯H 2 C 2 O 4 ˙2H 2 O,并加入足量的稀硫酸,加热反应完全后,用浓度为c(1/5KMnO 4 )=0.1000mol/L的高锰酸钾标准滴定溶液回滴剩余的草酸,消耗5.00ml,锰矿石中的MnO 2 的质量分数为()。
【单选题】Your company has a domain controller named Server1 that runs Windows Server 2008 R2 and the DNS Server server role. A server named Server2 runs a custom application.You need to configure DNS to includ...
A.
Host Info (HINFO)
B.
Service Location (SRV)
C.
Canonical Name (CNAME)
D.
Well-Known Service (WKS)
【简答题】称取含铝试样0.5000g,溶解后用8-羟基喹啉沉淀,得到0.3200gAl(C 9 H 6 NO) 3 沉淀。计算试样中铝的质量分数。沉淀形式若为Al 2 O 3 ,可得到多少克Al 2 O 3 沉淀物?[M(Al)=26.98g·mol -1 ,M(AlC 27 H 18 N 3 O 3 )=459.44g·mol -1 ,们(Al 2 O 3 )=101.96g·mol -1 ]
【单选题】They should do ________ about this terrible train service.
A.
something
B.
anything
C.
everything
D.
nothing
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