【判断题】(True or false) The 555 timer cannot be used as a pulse oscillator.
【单选题】对鲜猪肉进行外观鉴别时,次鲜猪肉的特点为()。
A.
表面有一层微干或微湿的外膜,呈暗灰色,有光泽,切断面稍湿、不黏手,肉汁透明
B.
表面有一层风干或潮湿的外膜,呈暗灰色,无光泽,切断面的色泽比新鲜的肉暗,有黏性,肉汁浑浊
C.
表面外膜极度干燥或黏手,呈灰色或淡绿色,发黏并有霉变现象,切断面也呈暗灰或淡绿色,很黏,肉汁严重浑浊
D.
表面微干或有风干的膜,无光泽,呈灰色或淡绿色,不黏手
【单选题】Please mark the bales with our initials SCC () a diamond.
【简答题】Please mark the cases (boxes, bags, casks, etc) as per the drawing given.
【单选题】As called for in our L/C, please mark all drums ______ with the shipping mark" × × ×" and the word "POISONOUS".
【简答题】Please mark the bales ______ our initials SCC ______ a diamond, ______ which comes the destination Bremen ______ order number 4424 below again.
【单选题】金融信托投资公司的主要风险不包括( )。
【简答题】A 555 timer is configured to run as an astable multivibrator as shown in Figure 7–91. Determine its frequency.
【单选题】典型的白盒测试方法包括静态测试和动态测试,静态测试方法包括( )
【判断题】The 555 timer has three basic operating modes: monostable, bistable, and astable.