测定全水分的煤样一旦取好后，样品是否密封已对结果不产生影响。
参考答案：错
解析：测定全水分的煤样一旦取好后，样品是否密封已对结果产生很大影响。
用所给词的适当形式填空。
1. My uncle often ____________ (watch) TV after supper.
2. Tom lives on the ____________ (five) floor.
3. She likes ____________ (sing) and dancing.
4. She ____________ (go) to work by bus every morning.
5. A salesperson can ____________ (be) either a man or a woman.
具有平肝潜阳，镇静安神功效的药物是（）
A.琥珀
B.远志
C.龙骨
D.酸枣仁
E.合欢皮
