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【单选题】
燃气管道随桥梁敷设，过河架空的燃气管道向下弯曲时，向下弯曲部分与水平管夹角宜采用( )形式。A.
30°
B.
45°
C.
75°
D.
90°
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举一反三
【简答题】Fill in each blank by using the correct forms of the expressions given below: all the top; come into view; change into; in all directions; lead up to; look up at; safety belts; take a special class Th...
【单选题】In doing mouth-to-mouth breathing, you have to ______ .
A.
open your mouth wide
B.
take a deep breath
C.
blow into his lungs
D.
do' all of the above
【单选题】If the patient vomits during mouth-to mouth resuscitation，the rescuer should FIRST（）.
A.
ignore it and continue mouth-to-mouth ventilation
B.
pause for a moment until the patient appears quiet again，then resume ventilation mouth-to-mouth
C.
switch to mouth-to-nose ventilation
D.
turn the patient's body to the side，sweep out the mouth and resume mouth-to-mouth ventilation
【单选题】which of the following statements is correct concernign available astern powr for diesel main propulsion systems?
A.
Astern power is to be provided in a sufficient amount to secure proper control of the ship in all normal circumstances
B.
The astern powr of the main propelling machinery is to provide for continuous operation astern at 60% of the ahead rpm at rated speed.
C.
For main propulsion systems without reversing gears, controllable pitch propellers or electric propulsion drive, running astern is not to lead to overload conditions.
D.
Astern power available will be equal to ahead power when controllable pitch propellers are utilized, thus discounting the need for increased operating parameters.
【单选题】()是婚姻关系成立的法定标志。内地居民办理婚姻登记的机关是县级人民政府民政部门或者乡(镇)人民政府，省、自治区、直辖市人民政府可以按照便民原则确定农村居民办理婚姻登记的具体机关。
A.
结婚宴席
B.
结婚照片
C.
结婚登记
D.
夫妻生活
【多选题】What is an unisexual flower?
A.
A flower lacking functional stamens
B.
an incomplete flower
C.
a flower that is pistillate
D.
an imperfect flower
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