【简答题】Bretton WoodsSystem and 1944 Agreement HowBretton Woods Introduced a New World Order By Kimberly Amadeo http://useconomy.about.com/od/monetarypolicy/p/Bretton-Woods-International-Monetary-System-And-1...
【单选题】能直接进行滴定的酸和碱溶液是:
A.
0.1mol/L HF (K a =6.8×10 -4 )
B.
0.1mol/L HCN (K a =4.9×10 -10 )
C.
0.1mol/L NH 4 Cl (K b =1.8×10 -5 )
D.
0.1mol/L NaAc (K a =1.8×10 -5 )
【单选题】设有一个成绩表Student_JAVA(id,name,grade),现需要查询成绩grade倒数第二的同学信息(假设所有同学的成绩各不相同),正确的SQL语句应该是( )
A.
SELECT * FROM Student_JAVA ORDER BY grade limit 1,1;
B.
SELECT * FROM Student_JAVA ORDER BY grade DESC limit 1,1;
C.
SELECT * FROM Student_JAVA ORDER limit 1,1;
D.
SELECT * FROM Student_JAVA ORDER BY grade DESC limit 0,1;
【单选题】设有一个成绩表Student_JAVA(id,name,grade),现需要查询成绩grade第二名的同学信息(假设所有同学的成绩各不相同),正确的SQL语句应该是()。
A.
SELECT*FROM Student_JAVA ORDER BY grade DESC limit 1,1;
B.
SELECT*FROM Student_JAVA ORDER BY grade limit 1,1;
C.
SELECT*FROM Student_JAVA ORDER limit 1,1;
D.
SELECT*FROM Student_JAVA ORDER BY grade DESC limit 0,1;
【简答题】Ex. 1. Arrange the following in proper form as they should be set out in a letter. 1 Sender's name: Hunan International Trading Corp. 2 Sender's address: 48 Huangxi Road, Changsha, Hunan, China 3 Sen...
【多选题】下列有关基因工程菌描述正确的是( )
A.
基因工程菌是利用目的基因转入细菌,使其能够表达所需要的蛋白
B.
基因工程菌引入现场环境后会与土著微生物菌群发生激烈竞争
D.
基因工程菌目的基因可以稳定地表达出特定的基因产物
【单选题】餐饮服务的特点,不包括以下( )。 A. B. C. D.