型钢梁中应用最多的是()和()。型钢梁的设计一般应满足强度,()和整体稳定的要求。
参考答案:普通热轧工字钢;H形截面型钢;刚度
阅读理解
1. When do they stop serving dinner?
A.10:00 am.
B.10:30 pm.
C.2:00 pm.
D.9:30 pm.
2. How much do a small hamburger and a large soft drink cost?
A. $3.9.
B. $3.95.
C. $4.1.
D. $4.9
3. How many kinds of things have chocolate in them?
A. One.
B. Two.
C. Three
D. Four.
下列选项中,不属于生物养地作用的是()。
A.保持NPK平衡
B.固氮
C.增加有机质
D.保持水土