为了在室内能欣赏到窗外景物而不让在室外的人看到室内，幕墙玻璃应选用( )。
A．吸热玻璃B．光栅玻璃C．热反射玻璃D．光致变色玻璃
参考答案：C
24. When we climbed up to the top of the mountain, we were all _______.
A．tired and out of the breath
B．tiring and short of the breath
C．tired and out of breath
D．tiring and short of breath
划针是用工具钢或弹簧钢丝制成，尖端应磨成（）度的尖角，并经淬火处理。
A.5～15
B.15～20
C.20～30
D.30～45
