牙髓中不含()
A.成牙本质细胞
B.成纤维细胞
C.巨噬细胞
D.成骨细胞
E.树突状细胞
参考答案:D
按要求改写下列各句,每空一词。
1. My pants are fifty dollars. (改为一般疑问句)
_____ _____ pants fifty dollars?
2. The black socks are 2 dollars.(对画线部分提问)
_____ _____are the black socks?
3. The store sells apples.(改为否定句)
The store _____ _____ apples.
4. Her sweater is yellow.(对画线部分提问)
_____ _____ is her sweater?
5. Are his shoes black?(作肯定回答)
Yes, _____ _____.
选用测量范围时,尽量使指针在万用表盘刻度正中或距“∞”符号()附近。
A、1/3
B、1/2
C、2/3
D、3/4