常用平衡梁有哪几种形式？
参考答案：
常用平衡梁有：①管式平衡梁、②槽钢型平衡梁、③钢板平衡梁、④桁架式平衡梁和⑤特殊结构的吊具。
用 dress, put on, have on, wear 或 dress。
1. Do you know the lady _____ glasses?
2. The mother ______ his son every day.
3. Mr Smith _____ his coat ____ and lefthurriedly.
4.The little girl _____ herself _____ as an angel.
5.The boy shouted, "The emperor ____ nothing ______ ! "
园林植物营养失调会引起缺素症，如植物缺（），会出现矮化、分枝少、失绿变色及组织坏死等现象。
A、氮
B、磷
C、钾
D、锌
