按照防治指标进行用药的是（）。
A、对症用药
B、适时用药
C、适量用药
D、交替用药
参考答案：B
Desserts made from apples, such as pies, apple pancakes and apples _____ in sugar are available for sampling.
A．dipping
B．dip
C．dipped
D．to dip
甲醇蒸发残渣的测定时放在水浴上蒸发时的蒸发温度控制多少度？
