发生急性心肌梗死时最先出现的症状是（）
A.心律失常
B.低血压和休克
C.疼痛
D.呼吸困难，疼痛
E.恶心，呕吐
参考答案：C
If the building project _____ by the end of this month is delayed, the construction company will be fined. [ ]
A. being completed
B. is completed
C. to be completed
D. completed
如覆盖区域无特殊情况，则方位角规划一般遵从0/120/240的原则，或在此方向上左右调整，调整幅度在（）度内。
