用焦磷酸法检定煤尘中的游离二氧化硅有操作繁琐()度差等缺点。
A.干燥
B.可视
C.成本
D.准确
参考答案:D
判断正“T” 误 “F”。
( )1. Close friends or relatives always shake hands when they meet each other.
( )2. Pizzas are from Italy.
( )3. £5.70 is "Five dollars seventy pence".
( )4. Dessert is the first course in a meal.
( )5. When two friends meet, they say Hi to each other.
在肾脏形成尿液的过程中,能被过滤并且全部被重新吸收的物质是()。
A.蛋白质
B.葡萄糖
C.无机盐
D.尿素