正常成年人腰椎侧隐窝前后径至少是（）
A.1mm
B.2mm
C.3mm
D.4mm
E.5mm
参考答案：C
用play或play the完成句子。
1. Jenny can _______ volleyball, and she can _______ violin.
2. Jet can _______ trumpet, and he can _______ basketball.
3. Mary can _______ piano, but she can't _______ guitar.
4. Bob can _______ ping-pong, but he can't _______ computer games.
5. Tony can _______ chess, and he can _______ baseball.
作为施工单位，采用( )合同形式，可最大限度减少风险。
A．不可调值总价B．可调值总价C．单价D．成本加酬金
