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【判断题】
维生素A的结构是具有共轭多烯醇侧链的环己烯,因而具有许多立体异构体,异构体间具有相似的化学性质、光谱特性和生物效价。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】异烟肼的作用特点是（ ）。
A.
结核杆菌不易产生耐药性
B.
高度选择性地作用于结核杆菌
C.
对多数革兰阳性菌有效
D.
不良反应的发生率与剂量无关
E.
对细胞内结核杆菌无效
【多选题】异烟肼的作用特点是
A.
疗效高、毒性小
B.
对结核杆菌有高度选择性，对其他细菌无作用
C.
对细胞内外结核杆菌均有作用
D.
单用不易产生耐药性
E.
与其他抗结核病药无交叉耐药性
【判断题】Prior to recording adjusting entries at the end of an accounting period, some accounts may not show proper financial statement amounts even though all transactions were correctly recorded.
A.
正确
B.
错误
【单选题】With modern audio- recording equipment, there is (are) ______.
A.
no difficulty in recording speakers in many face -to-- face situations or on the telephone
B.
still some difficulties in recording speakers in many face -to -face situations or on the telephone
C.
no difficulty in recording speakers in many face -to -face situatious but some on the telephone
D.
some difficulties in recording speakers in many face -to -face situations but not on the telephone
【判断题】Prior to recording adjusting entries at the end of an accounting period, some accounts may not show correct balances even though all transactions were properly recorded.
A.
正确
B.
错误
【多选题】异烟肼的作用特点是
A.
疗效高
B.
对结核杆菌有高度选择性，对其他细菌无作用
C.
对细胞内外结核杆菌均有作用
D.
单用不易产生耐药性
E.
与其他抗结核药无交叉耐药性
【简答题】甜味剂在食品加工中的意义
【单选题】With modem audio -recording equipment, there is (are) ______.
A.
no difficulty in recording speakers in many face -to-- face situations or on the telephone
B.
still some difficulties in recording speakers in many face -to -face situations or on the telephone
C.
no difficulty in recording speakers in many face - to - face situatious but some on the telephone
D.
some difficulties in recording speakers in many face - to - face situations but not an the telephone
【判断题】Prior to recording adjusting entries at the end of an accounting period, some accounts may not show correct balances even though all transactions were properly recorded.
A.
正确
B.
错误
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