在VBA中要判断一个字段的值是否为NULL，应该使用的函数是______。 发布时间：2018-04-30 12:36 │ 来源：www.tikuol.com 题型：填空题 问题： 在VBA中要判断一个字段的值是否为NULL，应该使用的函数是______。
题型：填空题 完形填空。 If we take a close look at successful language learners, we may discover a few techniques (技巧) which make language learning easier for them. 1 , successful language leamers are independent learners. They do not depend on (依赖) books or teachers; they 2 their own way learn the language. They try to find the patterns and the rules for themselves 3 waiting for the teacher to explain everything. They are good guessers who lcok for clues and form their 4 conclu.sions which are very different from others'. Successful language leaming is 5 learning. Therefore, successful learners do not wait for a chance to use the language; they 6 such a chance. They find people who speak the language and ask these people to correct them 7 . they make mistakes. They will try anything to communicate. When communication is difficult, they can 8 information that is imomplete (不完整的). It is more important for them to learn to 9 in the language than to know the meaning of every word. Finally, successful language learners are leamers with a 10 in order to communicate with these people and learn from them. They want to learn a language because t.hey are interested in the language and the people who speak. It is necessary for t.hem to learn the language.( )1. A. As usual ( )2. A. explain ( )3. A. instead of( )4. A. correct ( )5. A. ideal ( )6. A. look for ( )7. A. until ( )8. A. break ( )9. A. agree ( )10. A. purpose B. First of allB. make B. after B. own B. informal B. care about B. whether B. check B. ask B. certificate C. by the wayC. discover C. because ofC. only C. early C. work out C. before C. download C. think C. guide D. So far D. change D. from D. main D. active D. write downD. when D. accept D. read D. question 查看答案
题型：填空题 患者女性，42岁，因“间断性少量涕血，伴右侧耳痛、耳聋，右侧眼球外展运动受限”来诊。最有可能的诊断是（）A.肺结核B.上消化道出血C.鼻腔血管瘤D.鼻内翻性 * * 状瘤E.鼻咽部恶性肿瘤 查看答案
题型：填空题 “在卢梭民约论前约数十年，有此议论，不能不视为人类文化史最高出品。专著故自负，（顾）亭林亦复推重。乾隆间，此书列入禁书；光绪之季，吾曾私自传印，以为播送民主思想之工具。”对梁启超描述的这本书理解错误的是（）A.此书是指顾炎武的《天下郡国利病书》B.其议论的核心在于限制君权C.其观点与西方启蒙思想有些相似D.其对近代民主思潮的兴起有一定影响 查看答案