下列描述苹果轮纹病的是()。
A.树干及枝条上产生溃疡型病斑
B.树体负载量过高是发病的关键
C.受害果实常以皮孔为中心形成渍状斑点
D.病部常有黄褐色汁液流出,有酒糟味
参考答案:C
Unsatisfied ________ with the payment,he took the job just to get some work experience.
A.though was he
B.though he was
C.he was though
D.was he though
FMC根据当时的飞行情况由软件决定选取导航设备的信号,其选取的优先级是().
A.DME/VOR、DME/DME、ILS、仅用IRS
B.GPS、DME/VOR、DME/DME、仅用IRS
C.DME/DME、DME/VOR、ILS、仅用IRS
D.GPS、DME/DME、DME/VOR、仅用IRS