Shelf-Life and Dry Baking Parameters.保存期限及烘烤条件Shelf-Life /保存期限Shelf-Life is a function of solderability. Solderability of any final finish degrades over time due to oxidation or intermetallic compound
三大子句:名詞子句、形容詞子句、副詞子句1、名詞子句的功用:作主詞、作受詞、作補語、作同位語用。作主詞用時:What you are doing ems very difficult.句子中的What you are doing即是名詞子句作主詞用。另外要注意,名詞子句作主詞,用單數動詞。且名詞子句永遠是肯定敘述句的形式 ===>主詞+動詞军官和士官的区别+疑問詞+主詞+動詞。此種句型稱