气调养护，以防虫为目的，其C02浓度应控制在（） A．栓剂  B．合剂  C．糖浆剂

用括号中所给词的适当形式填空

1. Does Alice like_______(eat) fish very much?

2. The teacher made the boy_______(clean)the classroom all by himself yesterday.

3. Listen! Someone                _______(sing)in the next room.

4.                  _____ (not put) too much salt into the water.

5. —How many ______(banana) do we need?

    —We need one banana.

6. Then_______(add) the ingredients to the noodles.

7. And put two _______(teaspoon) of honey and a cup of yogurt into it.

8. ______(final)put another slice of bread on the top.

9. Do you know how               ______(make)a pizza?

10. Chinese food has different tastes and is_______(usual) very delicious! 1

液压电梯当柱塞通过其行程限位装置而到达其上限位置时，轿厢导轨应当能提供不小于（）的进一步制导行程.

在1970年代早期，业界中新门一种SMD，为“密封式无脚芯片载体”，常以（）简代之

A.BCC

B.HCC

C.SMA

D.CCS

设n阶实对称矩阵A满足A²=E，且秩r(A+E)=k＜n．
(Ⅰ)求二次型x^TAx的规范形；
(Ⅱ)证明B=E+A+A²+A³+A⁴是正定矩阵，并求行列式|B|的值．

企业编撰的财务会计报告应当以人民币反映。( )