【多选题】沙门氏菌属的生化反应特征是()。
C.
不分解蔗糖和水杨素,能利用丙二酸钠,液化明胶
【单选题】.______alone in a dark room, the little girl was so ______ at the _____ sound.
A.
Left; frightening; frightening
B.
Left; frightened; frightening
C.
Leaving; frightened; frightening
D.
Leaving; frightening; frightened
【单选题】____ in a dark room, the little girl was so frightened as to cry loudly.
【简答题】有人在测量二极管的电阻时,为了使测试笔和管脚接触良好,用两只手捏紧去测量,结果发现反向阻值偏小,认为不合格,但用在设备上却正常,这是什么原因?
【单选题】以下分离培养用的培养基选择错误的是( )
A.
沙门氏菌和志贺氏菌属的分离选用 SS 琼脂培养基。
C.
大肠杆菌和产气杆菌分离鉴别选择 TTC 培养基。
【单选题】下列关系中正确的个数为 ① ∈R;② Q;③|-3| N*;④| |∈Q; [ ]
【单选题】In 'The little girl is left alone in the house, weeping bitterly' the italicized part is the ______ of the sentence.
【简答题】有人在测量二极管的电阻时,为了使测试笔和管脚接触良好,用两只手捏紧去测量,结果发现反向电阻值偏小,认为不合格,但用在设备上却正常,这是什么原因?