【判断题】( )焊接的等离子弧和切割等离子弧的特性一样。
【单选题】(第九章)为简化锻件形状,将小孔、凹档、小台阶不予锻出而添加的那部分金属,称为 。
【单选题】When stock prices become more volatile, the ________ curve for gold shifts right and gold prices ________, everything else held constant.
【单选题】对颈椎损伤的病人,可以用()保持患者头和颈部不动。
【单选题】When gold prices become more volatile, the ________ curve for gold shifts to the ________; ________ the price of gold.
A.
supply; right; increasing
B.
supply; left; increasing
C.
demand; right; decreasing
D.
demand; left; decreasing
【单选题】What is the main idea of this passage?
A.
Gold prices are very volatile.
B.
Gold prices may drop further.
C.
Gold is a perfect inflation hedge.
D.
Predicting gold prices is very difficult.