【简答题】3-4 Special English NEWS Scientists are not yet able to say how deadly the new coronavirus really is. As the virus spreads around the world, the percentage of patients dying differs from one place...
【单选题】The purifier vibrates excessively. Which of the following causes is wrong? prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
The bowl is assembled improperly.
B.
The friction clutch is out of order. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
The vertical shaft bearings are damaged.
D.
The throughput is too high prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>