男，33岁，右肩部疼痛，巨大肿块，活动受限，结合图像，最可能的诊断是()
A．骨肉瘤
B．软骨瘤
C．骨软骨瘤
D．软骨肉瘤
E．骨转移瘤
参考答案：D
Whatever achievements you have achieved, you should not be ______with them. If you ____, it is
unlikely that you will make further achievements. [ ]
A. satisfied; do
B. content; do
C. satisfied; are
D. contented; are
若锅炉空气量过大，可能表现或造成（）。
A、炉温降低，燃烧不完全
B、二氧化碳表读数大
C、送引风机电耗率增大
D、不影响排烟热损失
