沉积岩的风化作用。
支气管哮喘急性发作时，控制症状首选的药物是（） ["po受体激动剂","糖皮质激素","抗胆碱能药物","茶碱类"]
接合生殖
潜意识
Which two design concerns must be addressed when designing a multicast implementation?（） [" only the low-order 23 bits of the MAC address are used to map IP addresses"," only the low-order 24 bits of the MAC address are used to map IP addresses"," only the high-order 23 bits of the MAC address are used to map IP addresses"," only the low-order 23 bits of the IP address are used to map MAC addresses"," the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses"," the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresse"]
明分使群
