单项选择题
Diesel powered industrial trucks on a ship that are provided with safeguards to the exhaust，fuel，and electrical systems are designated（）.
A.DEFE B.DE C.DS D.DES
单项选择题 Denebola is found in what constellation?（）
单项选择题 Deneb is found in what constellation?（）
单项选择题 Define the acronym MSI（）.
