KT4000电子气象仪风速探测最大为()Km/h。
A. 120.0
B. 180.0
C. 240.0
D. 280.0
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The separating effect of oil separator is not very good, the reason may be()
A. too little seal water
B. improper gravity disc
C. oil discharging pump not working very well
D. low water level of the working water
碳钢、低合金高强钢中含有较高的()时,极易发生热应变脆化现象。
A. 氢
B. 氧
C. 氮
大比值传动方式主要应用在()。
A. 客梯
B. 货梯
C. 杂物梯
D. 高速梯