现有若干个三角形,在所有的内角中,有5个直角,3个钝角,25个锐角,则在这些三角形中锐角三角形的个数是[ ]
A.3
B.4或5
C.6或7
D.8
答案:A
用所给词的正确形式填空。
1. How (do) your father go to work?
2. My brother (work) in a hospital.
3. My little sister likes (draw) pictures.
4. What (do) your father and mother do?
5. The policeman often (help) tourists find their way.
手提式防爆照明灯电量即将耗尽,提示电路将使灯光亮度瞬间变暗,在10分钟左右自动切断电源。