A.風(fēng)險規(guī)避 B.風(fēng)險減少 C.風(fēng)險消除 D.風(fēng)險轉(zhuǎn)移
A.0℃ B.10℃ C.30℃ D.60℃
A.40s B.50s C.60s D.100s