电保护法有几种类型?
参考答案:
1、外加电流阴极保护法,2、牺牲阳极保护法,3、排流保护法。
Questions 41-45 · Read the memo and notes below. · Complete the form below. · Write a word, phrase (in CAPPITAL LETTERS) or number on lines 41-45 on your Answer Sheet.MEMO TO: Shirley Tang From: Sue Hill Here are some notes I have taken concerning a training course which the company wishes to organize. I should be grateful if you could transfer the details to the appropriate form. Advanced Training Course, 27-30 April, to be held at Head Office. Aspects/Problems/Issues of Product Development precise title to be announced later but general subject title OK for now. Already 21 staff have indicated wish to attend, but this number is too large. So the total number must be cut down by 9. Conference Room will be too big, but Board Room should be ideal.TRAINING COURSE Commencement Date: (41) ______ Duration:(42) ______ Location. Building: Head Office Room:(43) ______ Maximum Number of Participants: (44) ______ Subject: (45) ______
基础墙防潮层的常用作法有哪些