clearance
名詞清潔,清掃; [建]凈空; 空隙,間隙; 放行證
名詞
1. There was a clearance of only ten centimetres between the two walls.
兩堵墻之間只有十厘米的空隙。
1. 間隙:看下土,處于中間位置的式快cam,最大因為升程間隙(clearance)最大. 處于右邊的是中速cam,形狀中等. 在左邊的是慢cam,升程最小,形狀最小. 好了,看看下面兩張圖就能明白了. 是不是現(xiàn)在覺得活瓣正時技術(shù)(VVT)已經(jīng)沒有之前那么神秘而高不可攀了呢?
2. 凈空:由於打線接合受導(dǎo)線末端成球大小、接合工具形狀、接墊之幾何排列與構(gòu)裝基板結(jié)構(gòu)凈空(Clearance)等條件的限制(2),因此僅適用於低密度連線(低於300個集積數(shù),Input/Output Counts)之構(gòu)裝.
3. 清除:目前存在著Hp清除(clearance)和Hp根除(eradication)兩個概念,前者系指治療結(jié)束時復(fù)查Hp陰性,后者是指停止治療1個月這后復(fù)查Hp陰性. 清除只是Hp暫時的抑制,停藥之后Hp感染很快復(fù)發(fā);而根除是指85%以病人1a之內(nèi)不復(fù)發(fā),起到了治療的作用.
4. 廓清率:於一般的情況下,肌酸酐的廓清率(clearance)應(yīng)與腎絲球過濾率(GFR)成正比,但腎絲球過濾率會受體內(nèi)水量多寡的影響,且大約14%的肌酸酐經(jīng)由腎小管的主動分泌排除,因此肌酸酐的廓清率并不能代表腎絲球過濾率.
1. 清除;清理
Clearance is the removal of old buildings, trees, or other things that are not wanted from an area.
e.g. ...a slum clearance operation in Nairobi...
內(nèi)羅畢拆除貧民窟的行動
e.g. The UN pledged to help supervise the clearance of mines.
聯(lián)合國承諾協(xié)助監(jiān)督掃雷工作。
2. (官方的)批準(zhǔn),許可
If you get clearance to do or have something, you get official approval or permission to do or have it.
clearance的反義詞
e.g. Thai Airways said the plane had been given clearance to land...
泰國航空公司說,該飛機已經(jīng)得到降落許可。
e.g. He has a security clearance that allows him access to classified information.
他持有安全許可,可以接觸機密信息。
3. (路面、河面與上方橋梁之間的)凈空,間隙,間距
The clearance of a bridge is the distance between the lowest point of the bridge and the road or the water under the bridge.
e.g. The lowest fixed bridge has 12.8m clearance.
最低的固定橋下方通行高度為12.8米。