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【简答题】
某射手对目标独立射击四次,至少命中一次的概率为80/81 ,则此射手的命中率
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举一反三
【单选题】The refrigeration system low pressure cutout switch is actuated by______.
A.
an electric system manager
B.
a sensing bulb at the tail coil of the evaporator
C.
pressure changes in the suction line
D.
failure of the king solenoid valve
查看完整题目与答案
【单选题】真空断路器的操动机构的型式是( )。
A.
液压式
B.
弹簧储能式
C.
电磁式
D.
手动式
查看完整题目与答案
【单选题】以下不能作为乳化剂的是
A.
天然亲水高分子材料
B.
表面活性剂
C.
电解质
D.
固体粉末
查看完整题目与答案
【单选题】以下不能作为乳化剂的是( )
A.
高分子乳化剂
B.
表面活性剂
C.
电解质
D.
固体粉末
查看完整题目与答案
【单选题】If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the ______.
A.
system was overcharged with refrigerant
B.
high pressure switch was improperly adjusted
C.
expansion valve strainers were fouled
D.
suction valves were leaking slightly
查看完整题目与答案
【单选题】The purpose of the refrigeration system low pressure cutout switch is to （）
A.
protect the compressor from liquid flood back
B.
protect the compressor from low discharge pressure
C.
start and stop the compressor upon system demand
D.
start the compressor after a drop in the evaporator pressure
查看完整题目与答案
【单选题】在有瓦斯区域进行爆破作业,爆破网路的连线方式只准采用 ()
A.
串联
B.
并联
C.
串并联
D.
并串联
查看完整题目与答案
【单选题】以下不能作为乳化剂的是
A.
高分子溶液
B.
表面活性剂
C.
电解质
D.
固体粉末
E.
凝胶
查看完整题目与答案
【多选题】ZZK-12型中置式开关柜配VSl型真空断路器，断路器合闸操作后，合闸弹簧不能贮能，可能的原因是（）故障
A.
储能电气回路
B.
电动机
C.
硅整流器或者微动开关
D.
机构的合闸传动和保持部分
查看完整题目与答案
【单选题】If the compressor runs continually, the cause might be the .
A.
high-pressure cutout switch is jammed open
B.
low-pressure switch is jammed shut
C.
thermal bulb is not operating properly
D.
scale trap is clogged
查看完整题目与答案
相关题目：
【单选题】The refrigeration system low pressure cutout switch is actuated by______.
A.
an electric system manager
B.
a sensing bulb at the tail coil of the evaporator
C.
pressure changes in the suction line
D.
failure of the king solenoid valve
查看完整题目与答案
【单选题】真空断路器的操动机构的型式是( )。
A.
液压式
B.
弹簧储能式
C.
电磁式
D.
手动式
查看完整题目与答案
【单选题】以下不能作为乳化剂的是
A.
天然亲水高分子材料
B.
表面活性剂
C.
电解质
D.
固体粉末
查看完整题目与答案
【单选题】以下不能作为乳化剂的是( )
A.
高分子乳化剂
B.
表面活性剂
C.
电解质
D.
固体粉末
查看完整题目与答案
【单选题】If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the ______.
A.
system was overcharged with refrigerant
B.
high pressure switch was improperly adjusted
C.
expansion valve strainers were fouled
D.
suction valves were leaking slightly
查看完整题目与答案
【单选题】The purpose of the refrigeration system low pressure cutout switch is to （）
A.
protect the compressor from liquid flood back
B.
protect the compressor from low discharge pressure
C.
start and stop the compressor upon system demand
D.
start the compressor after a drop in the evaporator pressure
查看完整题目与答案
【单选题】在有瓦斯区域进行爆破作业,爆破网路的连线方式只准采用 ()
A.
串联
B.
并联
C.
串并联
D.
并串联
查看完整题目与答案
【单选题】以下不能作为乳化剂的是
A.
高分子溶液
B.
表面活性剂
C.
电解质
D.
固体粉末
E.
凝胶
查看完整题目与答案
【多选题】ZZK-12型中置式开关柜配VSl型真空断路器，断路器合闸操作后，合闸弹簧不能贮能，可能的原因是（）故障
A.
储能电气回路
B.
电动机
C.
硅整流器或者微动开关
D.
机构的合闸传动和保持部分
查看完整题目与答案
【单选题】If the compressor runs continually, the cause might be the .
A.
high-pressure cutout switch is jammed open
B.
low-pressure switch is jammed shut
C.
thermal bulb is not operating properly
D.
scale trap is clogged
查看完整题目与答案