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【单选题】
用酸度计测定溶液的酸度，若溶液的pH值为4左右，对酸度计进行校正时需选用的标准缓冲液是（ ）。
A.
邻苯二甲酸氢钾标准缓冲液(pH 4.00)
B.
磷酸盐标准缓冲液(pH 6.86)
C.
邻苯二甲酸氢钾标准缓冲液(pH 4.00)和磷酸盐标准缓冲液(pH 6.86)
D.
磷酸盐标准缓冲液(pH 6.86)和硼砂标准缓冲液(pH 9.18)
E.
草酸三氢钾标准缓冲液(pH 1.68)和磷酸盐标准缓冲液(pH 6.86)
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举一反三
【单选题】材料题请点击右侧查看材料问题 查看材料
A.
Otherwise
B.
Instead
C.
Additionally
D.
Afterwards
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【判断题】口碑营销往往伴随着病毒式营销，它主要借助的就是受众自发传播的力量。
A.
正确
B.
错误
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【判断题】保藏的菌种如再使用,应用同种培养基来活化,并减少开管次数,防止污染。
A.
正确
B.
错误
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【单选题】听力原文：Mary was so exhausted last night that she dropped off to sleep in the chair instead of getting up and going to bed. (28)
A.
She dropped off the chair last night.
B.
She went to buy some bedroom furniture.
C.
She didn't sleep last night.
D.
She slept in the chair rather than on the bed.
查看完整题目与答案
【单选题】人类发展的驱动力不包括:()
A.
泰勒的科学原理
B.
达尔文的进化论
C.
弗洛伊德的“性心理学”
D.
马克思的“资本论”
查看完整题目与答案
【单选题】To the students' surprise, the teacher used talk ______ punishment to educate them.
A.
instead
B.
rather than
C.
without
D.
or rather
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【单选题】We should not ________ and laugh at those who have no homes to shelter from the rain and wind. Instead, we should be sympathetic of them. [     ]
A.
  look forward to
B.
  think highly of
C.
  pay attention to
D.
  look down upon
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【单选题】— Mike wants to know if _____ a picnic tomorrow. — Yes. But if it _____, we'll visit the museum instead. [     ]
A.
you have; will rain
B.
you will have; will rain
C.
you will have; rains
D.
will you have; rains
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【单选题】以下关于 IP 报文首部信息说法错误的是( )。
A.
IP 报文首部中固定部分的长度为 20 字节
B.
IP 首部中 TTL 最大值为 255
C.
如果高层使用 TCP 那么 IP 报文首部中协议号部分值为 17
D.
IP 报文首部中 IP 报文最小长度为 46 字节
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【单选题】Which of the following may contribute to a longer life span?
A.
Showing adequate trust instead of suspicion of others.
B.
Eating the food low in fat and driving with great care.
C.
Cultivating an optimistic personality and never losing heart.
D.
Looking on the bright side and developing a balanced level of risk.
查看完整题目与答案
相关题目：
【单选题】材料题请点击右侧查看材料问题 查看材料
A.
Otherwise
B.
Instead
C.
Additionally
D.
Afterwards
查看完整题目与答案
【判断题】口碑营销往往伴随着病毒式营销，它主要借助的就是受众自发传播的力量。
A.
正确
B.
错误
查看完整题目与答案
【判断题】保藏的菌种如再使用,应用同种培养基来活化,并减少开管次数,防止污染。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：Mary was so exhausted last night that she dropped off to sleep in the chair instead of getting up and going to bed. (28)
A.
She dropped off the chair last night.
B.
She went to buy some bedroom furniture.
C.
She didn't sleep last night.
D.
She slept in the chair rather than on the bed.
查看完整题目与答案
【单选题】人类发展的驱动力不包括:()
A.
泰勒的科学原理
B.
达尔文的进化论
C.
弗洛伊德的“性心理学”
D.
马克思的“资本论”
查看完整题目与答案
【单选题】To the students' surprise, the teacher used talk ______ punishment to educate them.
A.
instead
B.
rather than
C.
without
D.
or rather
查看完整题目与答案
【单选题】We should not ________ and laugh at those who have no homes to shelter from the rain and wind. Instead, we should be sympathetic of them. [     ]
A.
  look forward to
B.
  think highly of
C.
  pay attention to
D.
  look down upon
查看完整题目与答案
【单选题】— Mike wants to know if _____ a picnic tomorrow. — Yes. But if it _____, we'll visit the museum instead. [     ]
A.
you have; will rain
B.
you will have; will rain
C.
you will have; rains
D.
will you have; rains
查看完整题目与答案
【单选题】以下关于 IP 报文首部信息说法错误的是( )。
A.
IP 报文首部中固定部分的长度为 20 字节
B.
IP 首部中 TTL 最大值为 255
C.
如果高层使用 TCP 那么 IP 报文首部中协议号部分值为 17
D.
IP 报文首部中 IP 报文最小长度为 46 字节
查看完整题目与答案
【单选题】Which of the following may contribute to a longer life span?
A.
Showing adequate trust instead of suspicion of others.
B.
Eating the food low in fat and driving with great care.
C.
Cultivating an optimistic personality and never losing heart.
D.
Looking on the bright side and developing a balanced level of risk.
查看完整题目与答案