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【多选题】
关于洗面奶以下说法正确的是:A.
泡沫型洗面奶对油性污垢清洁能力较强
B.
根据使用目的的不同可分为普通型、磨砂型、疗效型
C.
合成型清洁剂性质温和，刺激性较肥皂明显减小
D.
皂类清洁剂是由脂肪。油脂及盐组成的pH为9.5~10的碱盐
E.
溶剂型洗面奶主要针对油性污垢
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【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The suces of the tubes ar...
A.
7
B.
21
C.
10.5
D.
4.666666666666667
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The suces of the tubes ar...
A.
10
B.
20
C.
40
D.
65
E.
15
F.
37.5
【单选题】The velocity of the wind,its steady direction,and the amount of time it has blown determines a wind driven current's ____.
A.
temperature
B.
density
C.
deflection
D.
speed
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The suces of the tubes ar...
A.
178.7
B.
53.2
C.
87.8
D.
128.5
E.
190
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The suces of the tubes ar...
A.
2.51
B.
0.0251
C.
2.59
D.
0.0259
E.
0.0255
F.
0.0293
【单选题】某单动往复栗 泵么活塞 直径为 4cm , 往复次数 为60次/min,冲程为1 5 cm , 该往复泵的理论流量为 ( ) L/min。
A.
11.3
B.
22.6
C.
678.2
D.
5.7
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The suces of the tubes ar...
A.
190
B.
53.4
C.
88.1
D.
129
E.
179.4
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