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【单选题】
已知某酶的Km为0.05 mmol/L,要使此酶所催化的v达Vmax的90%,底物浓度应是A.
0. 1mmol/L
B.
0.2 mmol/L
C.
0.45mmol/L
D.
0.5mmol/L
E.
1.0 mmol/L
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【单选题】以R134a代替过去常用的氟利昂作制冷剂,下列说法不对的是 。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检
C.
不能用硅胶做干燥剂
D.
排气温度调需采用水冷
【单选题】以R134a代替过去常用的氟利昂作制冷剂，下列说法不对的是（）。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检漏灯
C.
不能用硅胶做干燥剂
D.
排气温度高需要采用水冷
【单选题】He saluted as they passed. He saluted ____.
A.
while they had passed
B.
while they were passing
C.
though they were passing
D.
because they had passed
【单选题】以R134a代替过去常用的氟利昂作制冷剂，下列说法不对的是
A.
必须改用适于它的脂类润滑油
B.
不能用卤素捡漏灯
C.
不能用硅胶做干燥剂
D.
排气温度高需采用水冷
【简答题】• USD4500 Beijing, 10th March • I beg you to pay to Bank of China , Beijing
or order providing the goods they supply are complied with contract the sum of
Five Thousand United Sta...
【简答题】One day, a poor boy, named Howard Kelly, was trying to pay his way through school by selling goods door to door. He was hungry, 1 he decided to beg something to eat. When a young woman opened the door...
【单选题】75以R134a代替过去常用的氟利昂作制冷剂,下列说法不正确的是 。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检漏灯
C.
不能用硅胶作干燥剂
D.
排气温度高'需采用水冷
【简答题】III . 完形填空。 阅读下面短文,从短文后各题所给的 A 、 B 、 C 、和 D 四个选项中 , 选出可以填入空白处的最佳选项。 One day, a poor boy, named Howard Kelly, was trying to pay his way through school by selling goods door to door. He was hungry, 61 _...
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