下列哪项构成直疝三角（） A.腹直肌外缘、联合肌腱、腹股沟韧带 B.腹直肌外缘、腹壁

--- I’m afraid I can only make a small contribution this time.

--- __________. We really appreciate your assistance.

A．Every little helps

B．The more, the better

C．It’s better to give than to receive

D．The best things come in small packages

双翼采区

写信时，可用于平辈、朋友间的祝颂语有（）。

A.顺祝安好

B.此致敬礼

C.即问

D.恭颂

E.即此颂好

IR－3D、吹灰器的吹灰喷嘴与水冷壁向火面的距离应为（）mm。