下列气体既能用浓硫酸干燥，又能用固体氢氧化钠干燥的是（ ）
A．CO2
B．HCl
C．H2
D．NH3
答案：C
The great hall was crowded with many people, ______ many children ______ on their parents’ laps.
A．including; seated
B．including; seating
C．included; sat
D．included; sitting
铲运机CY一35型最大爬坡度（）。
A．31%
B．36%
C．35%
