题目内容
The most common type of sampler used in the mining industry is the gravimetric sampler（）
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The interaction of small particles with light is not a sensitive function of particle size and the optical properties（）
The 10-mm Dorr-Oliver cyclone separates the oversize dust from the respirable fraction （usually considered to have an aerodynamic diameter of（）or less）
PM10 is defined as particulate matter with a diameter less than or equal to（）
已知伏安法测电阻实验选用直流电压表（C31-V型 a=0.5 量程：0.045-0.075-3-7.5-15-30-75-150-300-600V， 3-600V的电压灵敏度：500Ω/V）；如果电压表量程选择30V，那么电压表的内阻是多少（）
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