摇测低压电缆及二次电缆的绝缘电阻时应使用（）摇表。 A.500V B.1000V C

神经纤维兴奋时所产生的Na⁺内流和K⁺外流，通过什么机制得以恢复静息状态（）。

A.脂质双分子层

B.载体蛋白

C.通道蛋白

D.钠泵

E.钙泵

短文填词

Dear Jack,

     I am writing to invite you to the fashion show to be held in

our school hall this Wednesday on 20th June to r________                                                    1.________

awareness of environmental________(保护) among                                                              2.________

middle school students.All the clothing in the show will

be m________from waste products,                                                                                     3.________

________as used newspapers,plastic packaging                                                                    4.________

bags,rubbish bags,and some o________waste.                                                                      5.________

Moreover,the fashion show will have v________of                                                                6.________

themes.There you will surely be able to see colorful

________(风格) and fashionable designs.I believe                                                                7.________

the show won't be________(失望) as all the                                                                        8.________

designers are required to combine fashion________                                                              9.________

the theme "A green world." What might s________                                                              10._______

you is that all the designers are coming from our school!

     If you are interested,call me before this weekend!

                                                  Yours,

                                                     Lily

对于血清中数种蛋白质抗原成分的分析，常可采用（）

A.单向扩散试验

B.双向扩散试验

C.免疫电泳法

D.对流免疫电泳

E.火箭免疫电泳

国际货物集装箱运输中，用以换取正本提单的是托运单中的( )

A．场站收据联

B．场站收据副本联

C．装货单联

D．场站收据副本大副联

下列属于抽象行政行为的有（）。

A.某大桥桥头有一块牌子，上写"6：00-21：00，非机动车辆不得上桥"，落款为该市公安局

B.某公安局对违反规定驾驶人力三轮车上大桥的人员处以50元的罚款

C.某劳动局规定，本辖区内企业与员工间的劳动合同应报经本局鉴证

D.某劳动局对辖区内某企业与员工间的劳动合同予以鉴