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【单选题】
唾液的浆液性分泌产物中富含的消化酶是( )
A.
淀粉酶
B.
舌酯酶
C.
蛋白酶
D.
核酸酶
E.
溶菌酶
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参考答案:
举一反三
【简答题】By the middle of the twentieth century, painters and sculptors in the United States_______________________. (开始在世界范围内对艺术发生重大影响)
【判断题】喷烤漆房的空气滤清系统是否正常关系到喷涂质量。
A.
正确
B.
错误
【判断题】阻容耦合多级放大电路便于集成。
A.
正确
B.
错误
【单选题】关于阻容耦合多级放大电路的特点,以下说法 错误 的是( )
A.
各级静态工作点相互独立
B.
不便于集成,多用于分立元件放大电路
C.
存在零点漂移现象
D.
低频特性较差,不能用于放大直流或缓慢变化的交流信号
【单选题】下列各组反应中,属于可逆反应的一组是(   )
A.
2H 2 O 2H 2 ↑+O 2 ↑,2H 2 +O 2 2H 2 O
B.
NH 3 +CO 2 +H 2 O====NH 4 HCO 3 ,NH 4 HCO 3 NH 3 ↑+H 2 O↑+CO 2 ↑
C.
H 2 +I 2 2HI,2HI H 2 ↑+I 2 ↑
D.
2Ag+Br 2 CuO2AgBr,2AgBr 2Ag+Br 2
【单选题】One of the central preoccupations of the arts and humanities is the observation of human beings. Painters and sculptors create images of the human form ; writers tell stories or compose poems about hu...
A.
And in our own lives, in our own ways, we spend a great deal of our energy and attention on our fellow creatures, being in families and other kinds of relationship, observing people with curiosity and interest in the course of the day, thinking about and forming our own character — deciding what kind of person we wish to be — as we grow.
B.
One of the central preoccupations of the arts and humanities is the observation of human beings.
C.
Painters and sculptors create images of the human form ; writers tell stories or compose poems about human experience; musical artists give melodic contours to the human spirit; historians and philosophers ponder the essential qualities of human civilization and nature.
【判断题】The sculptors in the Chen Clan Academy had a blueprint to design the dragon fish.
A.
正确
B.
错误
【判断题】对于塑料模具的模板、垫块等机构件,一般希望价格低廉,如果无特殊要求,一律选用碳钢。
A.
正确
B.
错误
【多选题】保税货物 指经海关批准未办理纳税手续而进境 ,在境内储存、加工、装配后复运出境的货物,此类货物又分为 哪两类?( )
A.
保税仓储货物
B.
保税加工货物
C.
保税物流货物
D.
保税再加工货物
【单选题】自位支承在定位过程中的作用一般只相当于 ( ) 个支承点。
A.
B.
C.
D.
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