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(1)①常温下,pH=3的盐酸和pH=11的氢氧化钡等 体积混合,溶液的pH= 。 ②常温下pH=3的盐酸和pH=6的盐酸等体积混合,溶液的pH= 。(lg2=0.3) (2)在某温度下,H 2 O的离子积常数为1×10 -13 ,则该温度下 ①某溶液中的H + 浓度为1×10 -7 mol/L,则该溶液呈 性。 ②0.01mol/LNaOH溶液的pH= 。 ③99mL pH=1的H 2 SO 4 溶液与101mL pH=12的KOH溶液混合后,溶液的pH= 。
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【判断题】发现一个好的企业想法是创业者实现愿望及创造商业机会的第一步。
A.
正确
B.
错误
【单选题】点火开关OFF时,步进电机应为()。
A.
全开
B.
1/2开度
C.
全闭
D.
1/4开度
【判断题】维新运动时期维新派崛起后,洋务派与顽固派一起变成了守旧派。
A.
正确
B.
错误
【判断题】α葡萄糖苷酶抑制剂(阿卡波糖):通过竞争性抑制双糖类水解酶α葡萄糖苷酶的活性而减慢淀粉等多糖分解为双糖和单糖,延缓单糖的吸收,降低餐后血糖峰值。
A.
正确
B.
错误
【单选题】What is the special feature of Effnet's firewall system?
A.
All the devices and parts are put in the basement.
B.
All the devices and parts are put into a single box.
C.
Cellular phone and Internet are part of this system.
【单选题】In fact, all of these devices are designed by him in his spare time.
A.
finally
B.
really
C.
actually
D.
usually
【单选题】Which of the following devices replicates and passes data to all devices connected to it?()
A.
Switch
B.
Router
C.
Bridge
D.
Hub
【单选题】___good care, the electrical devices in the area all work well.
A.
Regarding
B.
Thanks to
C.
Like
D.
Thanks for
【单选题】What devices have been installed in Beijing airport?
A.
Test paper is used to pick up particle on the surface of the luggage.
B.
Explosive-detection devices have been installed at the entrances in Beijing Airport.
C.
Passengers are urged to arrive at airports much earlier than before.
【单选题】点火开关 OFF 时 , 步进电机应为 ( ). A. B. C. 全闭
A.
全开
B.
1/2 开度
C.
全闭
D.
1/4开度
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