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【单选题】
下列叙述中与星不符的是A.
为半合成的卡那霉素
B.
属氨基糖苷类抗生素
C.
为卡那霉素中引3-氨基-2-羟基丙酰基的化合物
D.
侧链有手性碳原子
E.
对各种转移酶都稳定
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皮皮学刷刷变学霸
举一反三
【单选题】Equipment should be tested and maintained for proper operation on a regular().
A.
base
B.
ground
C.
basis
D.
field
【单选题】For proper operation of a Zener diode, the Zener diode must remain in the ( )
A.
forward-biased conduction region
B.
0-biased region
C.
reverse-biased cutoff region
D.
breakdown region
【简答题】This secondary current must be rectified and filtered before it can be used because transistors require direct current (DC) for proper operation. Electron tubes require DC for plate current; filaments...
【简答题】For proper fuel gauge operation, the _______________ must be in the OFF position before you add fuel to the fuel tank.
【单选题】For proper operation, auxiliary boiler feed water must have which of the following characteristics?
A.
High oxygen concentration
B.
Low pH
C.
Proper alkalinity
D.
All of the above
【单选题】For proper operation, whicl of the following characteristics must auxiliary boiler feed water have?
A.
High oxygen concentration.
B.
Low pH.
C.
Proper alkalinity.
D.
All of the above.
【单选题】The specific material selected for a particular tool is normally determined by the mechanical properties necessary for the proper operation of the tool. 这个句子的主语是( )
A.
t he specific material
B.
a particular tool
C.
the mechanical properties
D.
the proper operation
【多选题】与单式记账法相比,复式记账法的优点是(w)。
A.
有一套完整的账户体系
B.
可以清楚的反映经济业务的来龙去脉
C.
可以对记录的结果进行试算平衡，以检查账户记录是否正确
D.
记账手续简单
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