梅文鼎《勾股举隅》中给出了勾股定理的证明方法。()
阿布·韦发模型运用正弦定理解决了和角公式。()
参考答案:错误
旅客车厢每辆(双层客车每层)应配备()个定检合格的灭火器。
A. 4
B. 3
C. 2
D. 1
Which of the following conditions can cause above normal air temperature to develop in the
A. Clogged air intake falters
B. Piston blow-by
C. A defective after-cooler
D. Faulty exhaust valves