皮皮学,免费搜题
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搜题
【单选题】
关于生物膜的叙述正确的是( )
A.
是半透膜
B.
主要由磷脂构成双分子层
C.
蛋白质可以跨脂双层存在
D.
糖也可以跨脂双层存在
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皮皮学刷刷变学霸
举一反三
【单选题】SS4B型机车紧急制动性能试验时,制动缸最高压力应限制在( )kPa,且分配阀安全阀动作。
A.
380土10
B.
450士10
C.
450士20
D.
300土10
【多选题】制动机试验时,大闸由运转位打向紧急位时,有何现象?( )
A.
列车管压力3秒内降0
B.
制动缸压力持续升高,最终升至450Kpa
C.
有牵引级位时,主断路器跳开
D.
总风缸压力降0
【多选题】关于JZ-7型制动机自动制动性能的描述正确的是()。
A.
紧急制动后,制动缸最高压力420~450Kpa
B.
紧急制动后,制动缸上升到最高压力时间小于7秒
C.
紧急制动时,在3秒内列车管压力降到零
D.
常用全制动位制动缸压力330~3603Kpa
【单选题】The police caught tile man ______ into a house, videoed the whole process and arrested him ______.
A.
to break, on the spot
B.
break, on the spot
C.
break, on spot
D.
breaking, on the spot
【单选题】For the writer, the biggest obstacle during the whole process of attending college was ______.
A.
just getting started
B.
resistance from people at work
C.
to pass the American College Test
D.
culture shock experienced in college
【简答题】The whole process required a great deal of effort, skill and a luck.英译汉
【单选题】某一定量理想气体状态变化时,其内能随温度的变化关系如图中的 OA 直线 所示,则气体的状态变化过程一定是( )
A.
等压过程
B.
等体过程
C.
绝热过程
D.
上述过程都有可能
【多选题】安静时,在室温条件下( )皮肤的温度最高,( )最低。
A.
胸部
B.
头额部位
C.
四肢未端
【单选题】The teacher gives guidance to the students through the. whole writing process, and then abolishes the guidance gradually until the students are good at writing. Hare the teacheruses _________ approach...
A.
independent
B.
process
C.
communicative
D.
product
【单选题】The police caught the man ______ into a house, videoed the whole process and arrested him ______.
A.
to break, on the spot
B.
break, on the spot
C.
break, on spot
D.
breaking, on the spot
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