当韶山4改型电力机车抱轴瓦间隙超过()就应该重新挂合金或换瓦。
A.0.5mm
B.0.6mm
C.1mm
D.1.6mm
参考答案:C
Choose the right words. 选出正确的单词。
1. A teacher works in a (shop, market, school).
2. A clerk works in a (school, store, restaurant).
3. A (waiterss, businessman, clerk) works in a restaurant.
4. A waiter works in a (store, restaurant, school).
5. A (businessman, doctor, cashier) works in an office building.
诗句“不敢高声语,恐惊天上人”中“高”是指声音的 大(选填“音调”、“响度”或“音色”);医学中常用超声波击碎人体内的结石,这是利用了声音可以传递 。