题目

These problems are hard to         . Will you give me some advice?         A.work out                         B. look out         C. hand out                         D.break out 答案：A海波的熔点是48℃，则48℃的海波是（ ）A．一定是固态B．一定是液态C．一定是固液共存状态D．以上三种都有可能