冷菜和生食加工涉及到的预防食物中毒的原则包括()
A.保持清洁
B.避免交叉污染
C.使用安全的水和食品原料
D.严格洗消
参考答案:A, C, D
Although taking wedding photos has become more popular among graduating students, many students _______it requires both money and courage.
A.acknowledge
B.assess
C.forecast
D.deny
管子的热膨胀量与()有关。
A.介质温度
B.环境温差
C.管点长度
D.材料的线膨胀系数