To encourage adequate nutritional intake f

芹菜发生空心现象，在同一植株上是内叶先于外叶。

为保持自动站设备处于正常连续的运行状态，每小时正点前（）分钟要查看数据采集器的显示屏或计算机显示的实时观测数据是否正常。

A.5

B.10

C.15

建筑物内部装设的排水管道可以分为哪些类型？

The structure of interest rates results from all the following EXCEPT:（）

A. viewing each bond coupon payment as a separate zero coupon bond.

B. viewing a bond’s cash flows as having maturities ranging from the next coupon payment to the final payment at maturity.

C. creating the yield curve by plotting term to maturity against the coupon rate.

常用的灭火器主要有哪几种？