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Meselson-Stahl的DNA半保留复制证实试验中，区别不同DNA用（）方法。分离不同DNA用（）方法，测定DNA含量用（）方法。

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your company uses DHCP to lease IPv4 addresses to computers at the main office. A WAN link connects the main office to a branch office. All computers in the branch office are configured with static ip addresses. The branch office does not use DHCP and uses a different subnet. You need to ensure that the portable computers can connect to network resources at the main office and the branch office. How should you configure each portable computer?（）

A. Use a static IPv4 address in the range used at the branch office.
B. Use a alternate configuration that contains a static IP address in the range used at the main office.
C. Use the address that was assigned by DHCP as a static IP address.
D. Use an altermate configuration that contains a static IP address in the range used at the branch office.

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何谓珠光体？

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确诊先天愚型的检查为（）

A. 智商测定
B. 头颅拍片
C. 头颅CT
D. 染色体检查
E. 遗传病史

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当代中国的立法体制的特色是（）。

A. 多元多级多层次
B. 两元两级
C. 一元多级
D. 一元两级多层次

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