The offer is firm subject ____ before October 1.
A. for your reply reaches us
B. for your reply reaching us
C. to our receiving your reply
D. to your reply reaching us
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简易人工呼吸器1次可挤压入肺的空气量为().
A. 100~200ml
B. 300~400ml
C. 500~1000ml
D. 1200~1500ml
E. 1800~2000ml
在()竞争情况下,企业一般愿意进行非价格竞争。
A. 完全垄断
B. 完全竞争
C. 垄断竞争
D. 寡头垄断