The act of speaking will also help to improve listening comprehension（） ["to some way","in the way","to some extent","in the extent"]
交流电按频率分为（） ["高频","中频","低频","工频"]
下面哪一项不属于提高出裁率的原则（）。 ["A.先主后次","B.先大后小","C.好坏搭配","D.前后顺序"]
仓库中处于暂时停滞状态的物资是（） ["库存","储存","储备","储蓄"]
特异性的抗体在哪种动物体内？（） ["节肢动物","扁形动物","线形动物","脊椎动物"]
扫描电子显微镜的工作原理是什么？
