【单选题】Some of the engines were not suitable for the work they were ________ for.
【多选题】在发送电子邮件时,下列说法不正确的是( )
【单选题】在互联网上发送电子邮件时,下列说法不正确的是
【单选题】在固溶体的溶解度范围内,合金元素的质量分数越大,则强化作用( )
【简答题】Some criminals were printing ________ dollar bills until they were arrested. A) decent B) fake C) patent D) suspicious
【单选题】Some of the tunnels in the cliff are natural, some were ( ) out.
【单选题】Some rural African were infected with AIDS because they were given injections of Koprowski's vaccine.