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【判断题】
热水贮水罐或容积式水加热器上接出的热水配水管一般从设备顶接出，机械循环的回水管和冷水管从设备下部接入。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】练习题——与年长儿相比，婴幼儿上呼吸道感染的临床特点是
A.
以消化道症状为主
B.
以呼吸道症状为主
C.
以鼻咽部症状为主
D.
以全身症状为重
E.
以神经系统症状为主
【单选题】Which of the following statements on DNA replication is CORRECT ?
A.
DNA is synthesized by extending the 3′ end of the primer, because the 3′-OH acts as a nucleophile during catalysis
B.
DNA Pol use s four different active sites to recognize the four different dNTPs when it catalyzes DNA synthesis
C.
DNA Pol does not add rNTP to the 3′ end of the growing DNA strand because rNTP concentrations are too low in cells
D.
During DNA replication, the leading strand and lagging strand are synthesized toward opposite directions and cannot be coordinated
【多选题】The fidelity of DNA replication is maintained by:
A.
(1) base selection by the polymerase
B.
(2) a 3′→5′ proofreading exonuclease activity that is part of most DNA polymerases
C.
(3) specific repair systems for mismatches left behind after replication
D.
all the above
【多选题】经济发展新常态主要特点是( )
A.
从高速增长转为中高速增长
B.
经济结构不断优化升级第三产业、消费需求逐步成为主体
C.
城乡区域差距逐步缩小
D.
居民收入占比上升，发展成果惠及更广大民众
E.
从要素驱动、投资驱动转向创新驱动
【简答题】DNA的半保留复制(semiconservative replication)
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